[Feature flag] Clean Up `all_commits_compliance_report` feature flag

Summary

This issue is to cleanup the all_commits_compliance_report feature flag.

Owners

• Team: gitlab-org/govern/compliance
• Most appropriate slack channel to reach out to: #g_govern_compliance
• Best individual to reach out to: @wandering_person
• PM: @nrosandich

Clean up steps

• Create a merge request to remove <feature-flag-name> feature flag. Ask for review and merge it.
  • Remove all references to the feature flag from the codebase.
  • Remove the YAML definitions for the feature from the repository.
  • Create a changelog entry.
• Close the feature issue to indicate the feature will be released in the current milestone.
• Clean up the feature flag from all environments by running these chatops command in #production channel:
  • /chatops run feature delete <feature-flag-name> --dev --staging --staging-ref --production
• Close this issue.

Rollback Steps

• This feature can be disabled by running the following Chatops command:

/chatops run feature set <feature-flag-name> false