Since it is not possible to dynamically detect if a job is automatically
cancellable or not, a this new attribute is necessary. Moreover, it let
the maintainer of the repo to adjust the behaviour of the auto cancellation
feature to match exactly what he needs.

- We're also improving specs to avoid this could happen again

When using /due quick action with an invalid date a meaninful error
message is shown.

- Add new service that transfers milestones
from a group to a project
- Include new service in Projects transfer service
- Include FromUnion module in Milestone model
to use in transfer service
- Add specs for new milestones service
- Add specs for transferring milestones in
project transfer service

Backport EE "Track repository pushes as audit events"

See merge request gitlab-org/gitlab-ce!32304

Persist `needs:` validation as config error

See merge request gitlab-org/gitlab-ce!32648

In case when `needs:` is missing, but when requested by service,
we would not save the pipeline with config_error.

This makes it explicit that we want to persist the error
as `config_error` failure reason.

Remove spec/rails_helper.rb

Closes #66741

See merge request gitlab-org/gitlab-ce!32380

Modified schema via migrations.
Added one-to-one relationship between the two models.
Added changelog file