Remove direct rugged gem dependency

Vasilii Iakliushinrequested to merge
430709-remove-rugged-dependency into master

What does this MR do and why?

Remove direct rugged gem dependency

Contributes to #430709

Problem

The rugged gem is a C extension wrapping libgit2 that was historically used for git operations. All git operations have long since migrated to Gitaly, yet Rugged remained as a direct dependency with stale references scattered across the codebase, including dead rescue Rugged::ReferenceError clauses and obsolete TODO comments.

Solution

Remove gem 'rugged' from the Gemfile. It remains available transitively via licensee and undercover gems. Remove all direct Rugged API usage: Rugged::Settings configuration in spec_helper.rb and dead rescue Rugged::ReferenceError in TrackedRefType. Clean up stale Rugged comments across six files.

References

Screenshots or screen recordings

Not applicable — no UI changes.

How to set up and validate locally

  1. Run bundle install — verify it succeeds and rugged is still in Gemfile.lock (transitively via licensee/undercover)
  2. Run bundle exec rspec ee/spec/graphql/types/security/tracked_ref_type_spec.rb — all examples should pass
  3. Verify no remaining Rugged references: grep -r "Rugged" --include="*.rb" app/ lib/ ee/app/ ee/lib/ spec/ should return nothing

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