fix: enhance git remote validation by trying SSH URLs for generic hosts

[zzoubian]

Description

Fixes apm install fails the pre-install validation step when targeting a self-hosted Git server

Fixes #583

Type of change

• Bug fix
• New feature
• Documentation
• Maintenance / refactor

Testing

• Tested locally
• All existing tests pass
• Added tests for new functionality (if applicable)

[zzoubian]

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[danielmeppiel]

Review Feedback

Thanks @zzoubian for tackling this! The SSH-first approach for generic hosts is sound. A few things need addressing before merge:

1. CLA not signed (blocker)

Please reply to the CLA bot comment with @microsoft-github-policy-service agree to sign the Contributor License Agreement.

2. Missing encoding="utf-8" on subprocess call (regression)

PR #591 (just merged) added encoding="utf-8" to all subprocess.run(..., text=True) calls to fix crashes on Windows with non-UTF-8 consoles (CP950/CP936). Your new subprocess.run call at line ~448 needs the same:

result = subprocess.run(
    cmd,
    capture_output=True,
    text=True,
    encoding="utf-8",  # <-- add this
    timeout=30,
    env=validate_env,
)

3. No unit tests

Please add tests covering:

• SSH URL tried first for generic hosts, succeeds
• HTTPS fallback when SSH fails
• Non-generic hosts (GitHub/GHES) skip SSH attempt

Note on _build_repo_url

The call to ado_downloader._build_repo_url(use_ssh=True) uses a private method. This is pre-existing (main already calls it for HTTPS), but worth noting for a future refactor to expose a public API for URL building.

Relationship with PR #587

This PR complements #587 (which fixes the download path for Gitea). They don't conflict -- #584 fixes validation, #587 fixes download. Both can merge independently.

[zzoubian]

Ok added unit tests and replied to CLA with
@microsoft-github-policy-service agree

[sergio-sisternes-epam]

Clean fix that aligns validation with the existing download behavior in _clone_with_fallback(). SSH-first for generic hosts, HTTPS fallback — well tested with 5 cases covering the happy path, fallback, and negative scenarios. All prior review feedback addressed.

CodeQL note: The CodeQL failure is a false positive on test URL strings — not a code issue.