When a forked merge request was created with the same branch name as the
target name, MergeRequests::RefreshService would always create a new
diff even though nothing had changed. For example, on GitLab.com:

1. There were a number of merge requests in the gitlab-ce and www-gitlab-com
projects that had old merge requests from the community.
2. These merge requests originated from forked projects and used the
source branch master.
3. When someone pushed to master in the main repository, MergeRequests::RefreshService
would see that master matched the merge requests in question and generated a new
diff.
4. This led to an explosion of merge request diffs and slowed down the "Changes"
tab considerably.

This change alters MergeRequests::RefreshService so that it will only
refresh the diff if the merge request's source project and branch
match. Otherwise, the refresh will only happen if a pushed commit
contains a commit relevant to the existing merge request.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/53153

Update GitLab Pages to v1.3.0

See merge request gitlab-org/gitlab-ce!22666

Replace deprecated uniq on a Relation with distinct

See merge request gitlab-org/gitlab-ce!22625

Rename 'sast_container' licensed feature

See merge request gitlab-org/gitlab-ce!22662

Upgrade whitequark/parser to 2.5.3.0

See merge request gitlab-org/gitlab-ce!22652

Delete job_spec.js

See merge request gitlab-org/gitlab-ce!22664

Truncate milestone title on collapsed sidebar

See merge request gitlab-org/gitlab-ce!22624

Fix broken "Show whitespace changes" button on MR "Changes" tab

Closes #52122

See merge request gitlab-org/gitlab-ce!22539

Remove all tables from Pipeline page when there is no job for the Pipeline

Closes #45669

See merge request gitlab-org/gitlab-ce!18540

Extract ee specific lines for issues and mr controllers

See merge request gitlab-org/gitlab-ce!22569

Fix open-ended params for api_json.log

Closes #53155

See merge request gitlab-org/gitlab-ce!22623

adds warning against Postgres across NFS

See merge request gitlab-org/gitlab-ce!22278

CE Backport: Show actual Milestone dates within tooltips for Milestones in Epics sidebar

See merge request gitlab-org/gitlab-ce!22653

post merge pipeline and environments status

Closes #47799

See merge request gitlab-org/gitlab-ce!22292

Clarify last board navigation documentation

Closes gitlab-ee#7760

See merge request gitlab-org/gitlab-ce!22618

`Create a new tag` json Missing double quotes

See merge request gitlab-org/gitlab-ce!22614

Models and migrations for group level clusters

See merge request gitlab-org/gitlab-ce!22307

Add None/Any options for assignee in search bar

Closes #52383

See merge request gitlab-org/gitlab-ce!22599

Backport CE route changes for Ops Dashboard in EE

See merge request gitlab-org/gitlab-ce!22640

Fixing count on Milestones

Closes #50848

See merge request gitlab-org/gitlab-ce!21446

Merge branch '52780-stale-pipeline-status-cache-for-_project-after-disabling-pipelines' into 'master'

Resolve "Stale pipeline status cache for `_project` after disabling pipelines"

Closes #52780

See merge request gitlab-org/gitlab-ce!22589

This squelches the following warning:

warning: parser/current is loading parser/ruby24, which recognizes
warning: 2.4.4-compliant syntax, but you are running 2.4.5.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.

Even though we currently only should have one group for a cluster, we
allow the flexibility to associate to other groups in the future.

This also matches the runner <=> groups association.

- Adds Cluster#first_group, aliased to Cluster#group. For the
conceivable future, a cluster will have at most one group.

- Prevent mixing of group and project clusters. If project type
clusters, it should only have projects assigned.  Similarly with groups.

- Default cluster_type to :project_type. As it's very small table we can
set default and null: false in one release.

Update links to external sites

See merge request gitlab-org/gitlab-ce!22578

Add failure reason for execution timeout

See merge request gitlab-org/gitlab-ce!22224

remove duplicate section for enabling at project level

See merge request gitlab-org/gitlab-ce!22627

User not defined in PostReceive#process_project_changes

Closes #51335

See merge request gitlab-org/gitlab-ce!22519