Fixes #52349

Summary

This fixes git source fetching so no_cache=True is honored when a package changes git fetch options such as submodules=True.

Changes

• Preserve explicit no_cache=True when constructing git fetchers for commit-based versions
• Re-fetch an existing expanded git stage when caching is disabled instead of reusing stale staged sources
• Include submodule-related git fetch options in the source-cache key so cached archives with different submodule behavior do not collide
• Add regression tests for stale git stages, commit variants with no_cache=True, and submodule-sensitive cache keys