Document how to run frontend tests

Closes #53757

See merge request gitlab-org/gitlab-ce!24202

Add headers to files in the tree list on merge requests

Closes #54807

See merge request gitlab-org/gitlab-ce!23954

CE backport of "Track export issues CSV usage on GitLab.com with Snowplow"

See merge request gitlab-org/gitlab-ce!24217

Resolve "Track import issues CSV usage on GitLab.com with Snowplow"

Closes #8775

See merge request gitlab-org/gitlab-ee!9067

Remove comma from issuable email

See merge request gitlab-org/gitlab-ce!24218

Fixes z-index and margins of archived alert

Closes #56019

See merge request gitlab-org/gitlab-ce!24193

Wait for Web IDE commit animation

Closes #55972

See merge request gitlab-org/gitlab-ce!24196

ActiveRecord::Migration -> ActiveRecord::Migration[5.0] for
AddAlertManagerTokenToClustersApplicationPrometheus and EnqueuePrometheusUpdates

See merge request gitlab-org/gitlab-ee!9049

Add tests for Gitlab::Vulnerabilities classes

Closes #8707

See merge request gitlab-org/gitlab-ee!9025

EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9067

Improve `bin/secpick` script and add more options

See merge request gitlab-org/gitlab-ce!24117

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54807

Update Codesandbox smooshpack library

Closes #53779

See merge request gitlab-org/gitlab-ce!24191

Added feature to specify a custom Auto DevOps chart repository

Closes #55791

See merge request gitlab-org/gitlab-ce!24162

Check if specific type of background migration are done

See merge request gitlab-org/gitlab-ce!24032

Enable some frozen string in ee/lib

See merge request gitlab-org/gitlab-ee!8989

[Data migration] Sync Approver/ApproverGroup with ApprovalRule/ApprovalRuleMember

Closes #1979

See merge request gitlab-org/gitlab-ee!8669

A "click_button" event will be triggered when the import button
of the Issues import modal is clicked.

Useful for checking progress.

Caused uniqueness constraint when inserting as users

Prevents duplicated record.

Changes to Approver/ApproverGroup are reflected to rule members.

Skip syncing code rules for approver hooks
This avoids duplicated effort as it is sync by other hooks

Do no force a find by the name

Fix spec

Finding id is enough for update