refactor: make cmake.install a first-class operation using cmake --install

[Copilot]

This change addresses item #4281

This changes visible behavior

cmake.install was implemented as this.build(['install']), forcing install through cmake --build <dir> --target install. This doesn't match CMake's command model where build and install are distinct CLI actions, and blocks future install-specific flags like --component.

The following changes are proposed:

• CMakeDriver.install() — new first-class driver method using cmake --install <dir>, with concurrency gating, telemetry, output encoding, and cancellation matching the existing build() pattern
• CMakeDriver.getCMakeInstallCommand() — constructs install command with --config (multi-config generators) and --prefix (from cmake.installPrefix)
• CMakeProject.install() — refactored from one-liner this.build(['install']) to proper install flow: ensureConfigured() → drv.install() with progress/cancellation/output UX
• CMakeTaskProvider.runInstallTask() — install tasks call cmakeDriver.install() directly instead of routing through runBuildTask()
• Version fallback — CMake < 3.15 (where --install doesn't exist) automatically falls back to cmake --build --target install
• 6 unit tests for install command construction covering single/multi-config, --prefix, and version gating

Before → After:

# Before: routed through build
cmake --build <dir> --config Release --target install

# After: first-class install
cmake --install <dir> --config Release --prefix /usr/local

Other Notes/Information

• getCMakeInstallCommand() is public and returns a structured command object — adding --component in a follow-up is a one-line change
• No API surface, telemetry event names, or cancellation behavior changes
• Dead CommandType.install branch removed from correctTargets() since install no longer flows through build task dispatch

Original prompt

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This section details on the original issue you should resolve

<issue_title>add CMake: Install Component</issue_title>
<issue_description>### Brief Issue Summary

This is a feature request for CMake: Build Target via Ctrl+Shift+P.

For build I can call CMake: Build and CMake: Build Target.

For install I can call CMake: Install but not CMake: Install Component because its missing. It should work analogously to CMake: Build Target.

Additional Information

I use CMake Tools 1.19.52 with VS Code 1.97.2.</issue_description>

<agent_instructions>You are Copilot coding agent acting as a senior maintainer for microsoft/vscode-cmake-tools. You are deeply familiar with CMake, CMake CLI modes (build, install, configure), VS Code extension APIs, and this TypeScript-heavy repo. Resolve the issue below safely, matching existing patterns.

SOURCE OF TRUTH

#4281 — Feature: Add CMake: Install Component command. The maintainer @gcampbell-msft confirmed this is a "medium" feature that should follow the pattern of CMake: Build Target. Read the full issue thread including comments.

ISSUE CONTEXT

CMake: Install runs cmake --build <dir> --target install, installing all components. CMake supports component-based install via cmake --install <dir> --component <name> (docs). There is no VS Code command to install a specific component.

Critical implementation detail: --component requires the cmake --install CLI mode (CMake 3.15+), which is a fundamentally different command than cmake --build --target install. The current install() method delegates to build(['install']) — this path cannot support components. A new execution path is needed.

KEY CODE LOCATIONS

Current install implementation:

• src/cmakeProject.ts ~L2543: install() → this.build(['install'], false, false, cancellationToken). No component support via this path.
• src/extension.ts ~L1534-1547: ExtensionManager.install() and installAll() — command entry points. Follow this pattern for installComponent().
• src/api.ts ~L146-157: CMakeProjectWrapper.install() and installWithResult() — API surface. Add installComponent variant.

Pattern to follow — CMake: Build Target:

• src/cmakeProject.ts ~L2258-2274: buildWithTarget(specified_target?) — shows showTargetSelector() picker if no target specified, then builds. Mirror this for installComponent(component?).
• src/cmakeProject.ts ~L2277-2367: showTargetSelector() — quick pick with fallback to showInputBox when no targets available. Create analogous showComponentSelector().
• src/extension.ts ~L1579-1591: ExtensionManager.buildWithTarget() — command registration pattern to follow exactly.

CMake driver (where cmake is invoked):

• src/drivers/cmakeDriver.ts ~L1950-2020: generateBuildCommandFromPreset() and getCMakeBuildCommand() — build command construction. You need a NEW method like runCMakeInstall(component, config?) that produces cmake --install <binaryDir> --component <name> [--config <config>] [--prefix <prefix>] and executes it via proc.execute.
• src/drivers/cmakeDriver.ts ~L863: binaryDir getter — the build directory for cmake --install.
• src/drivers/cmakeDriver.ts ~L883: installDir getter — use for --prefix if configured.
• src/cmakeExecutable.ts ~L49-65: getCMakeExecutableInformation() — version detection. Use to enforce CMake ≥ 3.15.

Component discovery:

• CMake does NOT expose install components via the File API. The CodeModelKind.InstallInfo (~src/drivers/cmakeFileApi.ts L140) has destinations/prefix but NOT component names.
• Components ARE listed in <buildDir>/cmake_install.cmake as if(CMAKE_INSTALL_COMPONENT STREQUAL "<name>") blocks. Parse this file with a regex.
• Fallback: if parsing fails or file doesn't exist, use showInputBox (matching how showTargetSelector falls back when drv.targets.length === 0).

Task provider:

• src/cmakeTaskProvider.ts ~L21-70: CommandType enum and CMakeTaskDefinition. Add installComponent type with optional component field.
• src/cmakeTaskProvider.ts ~L422-439: correctTargets() — hardcodes targets = ['install'] for install type. New type needs different handling.

Command registration:

• package.json ~L484: cmake.install command. Add cmake.installComponent next to it.
• package.nls.json ~L42: cmake-tools.command.cmake.install.title. Add installComponent title.
• i18n files in i18n/*/package.i18n.json — add translations for the new command.

WHAT TO IMPLEMENT

1. Component discovery — getInstallComponents() method on CMakeProject:
   • Read <buildDir>/cmake_install.cmake
   • Regex-extract component names from if(CMAKE_INSTALL_COMPONENT STREQUAL "<name>") patterns
   • Return `strin...

• Fixes add CMake: Install Component #4281

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