Refactor handle_receive_pack to use unified process_newly_available_git_data

Replace ~100 lines of duplicated post-push processing in handle_receive_pack
with a single call to the unified process_newly_available_git_data function.

The unified function handles all post-git-data-available processing:
- Discovering satisfiable events from purgatory (state and PR events)
- Syncing OIDs to authorized owner repos
- Aligning refs (+ setting HEAD) in all owner repos
- Saving events to database
- Notifying WebSocket subscribers
- Removing from purgatory

This ensures consistent behavior regardless of how git data arrives
(git push vs purgatory sync fetching from remote servers).

Also mark test-only internal methods with #[cfg(test)] to silence
dead code warnings.

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