chore(git-integration): housekeeping

[mbani01]

This pull request makes minor adjustments to the commit_service.py and maintainer_service.py files. The most notable changes are the removal of an unused constant and the elimination of a special-case skip for "envoyproxy" repositories in maintainer processing.

Key changes:

Commit Service Improvements:

• Removed the unused _COMMITTED_COMMIT_SUFFIX constant from the CommitService class.
• Added a clarifying comment to explain the typo in the "commited-commit" string used for hashing, noting that correcting it would require a major migration, but that it currently has no significant effect.

Maintainer Service Logic:

• Removed the logic that skipped maintainer processing for repositories owned by "envoyproxy," allowing these repositories to be processed like any others.

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