feat: adding configurable ssh-hosts for git-based skills

[jmunozro]

Fixes #1524

[Copilot]

Pull request overview

Adds support for scanning SSH host keys for custom Git servers when initializing git-based skills, addressing issue #1524 so SSH clones work beyond the previously hardcoded public hosts.

Changes:

• Extend the skills-init script template to run ssh-keyscan for additional SSH hosts (including optional ports).
• Update the agent translator to extract unique SSH hosts/ports from ssh:// GitRefs and pass them into the template.
• Expand translator tests to cover custom SSH host scanning and make auth secret assertions dynamic.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
go/core/internal/controller/translator/agent/skills-init.sh.tmpl	Renders additional ssh-keyscan lines for extracted SSH hosts/ports.
go/core/internal/controller/translator/agent/adk_api_translator.go	Parses SSH GitRef URLs to produce a unique list of hosts/ports for the init script.
go/core/internal/controller/translator/agent/git_skills_test.go	Adds a test case for SSH URL host scanning and adjusts secret name assertion.

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[jmunozro]

@copilot open a new pull request to apply changes based on the comments in this thread