appengine-go: Deprecate manifest

[YusufKhalifadev]

This PR removes appengine-go, as it's no longer available as a standalone SDK. The best way is to install gcloud and install it from there.

• Use conventional PR title: <manifest-name[@version]|chore>: <general summary of the pull request>
• I have read the Contributing Guide

[coderabbitai]

📝 Walkthrough

Walkthrough

The file bucket/appengine-go.json has been entirely deleted. This manifest contained package metadata for the App Engine Go SDK, including architecture-specific download endpoints, SHA256 integrity hashes, extraction directory configuration, a PowerShell installer command referencing pyshim.ps1, a list of provided binaries (appcfg, backends_conversion, bulkloader, etc.), and autoupdate settings that generated SDK download URLs using version placeholders.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description provides context for the removal, explains the rationale (package no longer available standalone), suggests an alternative (gcloud), and includes completed checklist items confirming conventional title format and contribution guide review.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title 'appengine-go: Deprecate manifest' accurately describes the main change, which is the removal/deprecation of the appengine-go.json manifest file.

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