Remove hard-coded master strings and references from our tooling
Part of gitlab-com/gl-infra/delivery#1440 (closed)
361084e4 - Remove default branch literal from AutoDeployPressure
f2e45caa - Remove master usage from Security::MergeTrainService
ec408ea5 - Allow specific violations of DefaultBranchLiteral
7ec13a79 - Remove uses of master in MergeRequestsValidator code
1c8dd542 - Add Release::Metadata project
This allows us to take advantage of the default_branch method and
remove a DefaultBranchLiteral violation from ReleaseMetadataUploader.
3fb8790c - Resolve DefaultBranchLiteral violations in RemoteRepository
Two violations existed in the now low-level ensure_branch_exists and
checkout_new_branch method signatures. As the only remaining uses were
in the class's specs, we've removed the default value and made it a
required keyword argument.
e99374e8 - Regenerate .rubocop_todo.yml
ReleaseTools/DefaultBranchLiteral is now enabled.