Merge branch 'backstage/gb/populating-pipeline-refactoring' into feature/gb/variables-expressions-in-only-except
* backstage/gb/populating-pipeline-refactoring: (860 commits)
Add specs for extracted pipeline-related methods
Bring seeds size method back to CI/CD pipeline class
Improve YAML processor specs and remove unused code
Fix static analysis and tests related to YAML processing
Add specs for pipeline chain that builds stages and jobs
Do not select included stage seeds in populate chain
Decouple YAML processor from pipeline objects
Move policy related specs our of YAML processor tests
Fix rubocop offense in pipeline build seed class
Add a guard clause to avoid creating empty stages
Evaluate only/except policies outside of YAML processor
Make it easier to test pipeline stage seeds
Reduce stage seeds coupling between pipeline and YAML
Add specs for chain element that populates a pipeline
Populate pipeline with objects before creating it
Remove legacy service for creating pipeline stages
Decouple pipeline stage seeds from building environments
Support building all pipeline resource before saving
Introduce pipeline build seeds
Start building abstraction over pipeline seeds
...
Conflicts:
lib/gitlab/ci/yaml_processor.rb
spec/lib/gitlab/ci/yaml_processor_spec.rb
