Resolve Style/SymbolProc in spec/workers/snippets/schedule_bulk_repository_shard_moves_worker_spec.rb

This issue is part of the Source Code Management backend team's effort to resolve RuboCop violations.

Violation

File: spec/workers/snippets/schedule_bulk_repository_shard_moves_worker_spec.rb Cop: Style/SymbolProc

Steps to resolve

1. Remove the entry from the RuboCop todo file
2. Fix the violation in the code
3. Ensure tests pass
4. Submit the merge request