Resolve "Improved group lists UI"

Closes #52366

See merge request gitlab-org/gitlab-ce!26542

RSpec::Parameterized syntax for CI pipeline build seed specs

See merge request gitlab-org/gitlab-ce!29947

This updates the groups list UI to match the style of the project list:

- New layout
- Improve loading state when loading group children
- Larger, responsive text
- Icon and text colors changed to secondary
- Smaller button sizes
- Content list description colors were standardized to body text

Fix label serialisation in issue and note hooks

Closes #63473

See merge request gitlab-org/gitlab-ce!29850

Show create merge request button on confidential issues

See merge request gitlab-org/gitlab-ce!29688

Update tar to 2.2.2

See merge request gitlab-org/gitlab-ce!29949

Based on review comment fetching labels hook_attrs is now
wrapped in an issue's model method.

https://gitlab.com/gitlab-org/gitlab-ce/issues/58583

FIX: Scheduled pipelines scheduled to run at the same time as pipeline_schedule_worker gets pushed to the next run

Closes #63469

See merge request gitlab-org/gitlab-ce!29848

Automatically update MR merge-ref along merge status

See merge request gitlab-org/gitlab-ce!29569

Remove tooltip directive on project avatar image component

Closes #51990

See merge request gitlab-org/gitlab-ce!29631

Fix EE differences in services/_form.html.haml

Closes gitlab-ee#11032

See merge request gitlab-org/gitlab-ce!29931

Fix notes email with group-level notification email

Closes #63355

See merge request gitlab-org/gitlab-ce!29889

A Noteable doesn't have a group directly, unless it's an epic - we need
to look for the project's group to find the right email address.

Remove deprecated call in BuildSuccessWorker

Closes #63622

See merge request gitlab-org/gitlab-ce!29958

Bump GITALY_SERVER_VERSION to v1.48.0

See merge request gitlab-org/gitlab-ce!29974

Add to list of functionality

See merge request gitlab-org/gitlab-ce!29876

Merge branch '17690-Protect-TeamCity-builds-for-triggering-when-a-branch-is-deleted-And-add-MR-option' into 'master'

Skip TeamCity trigger on branch delete and support MR triggers

Closes #13871 and #17690

See merge request gitlab-org/gitlab-ce!29836

Refactor and add version text to variable syntax

See merge request gitlab-org/gitlab-ce!29964

If pipeline schedule is to run at the exact same time with when cron
worker runs, the pipeline schedule will not be executed at the
ideal timing.

We fix this bug by comparing the exact matching of ideal and
cron worker's next run at.

Update pagination prev and next texts

See merge request gitlab-org/gitlab-ce!29911

Add how to migrate deployments for deploy boards

See merge request gitlab-org/gitlab-ce!29872

Enable JIT Kubernetes resource creation for project level clusters

See merge request gitlab-org/gitlab-ce!29515

Memoize non-existent custom appearances

See merge request gitlab-org/gitlab-ce!29957

Docs: Correct group path instructions

See merge request gitlab-org/gitlab-ce!29869

Enable Gitaly ref name caching for discussions.json

See merge request gitlab-org/gitlab-ce!29951

Re-add ignore_column for import columns

See merge request gitlab-org/gitlab-ce!29959

Improve #has_metrics? and Environment#has_terminals?

See merge request gitlab-org/gitlab-ce!29847

Docs: link to predefined env variables reference more evident

Closes #62845

See merge request gitlab-org/gitlab-ce!29857

This `ignore_column` was present for a while but recently removed, but
to ensure we don't get error 500s let's keep it for a while.

We now create_deployment on Ci::Build create.
No need to call create_deployment again

This saves about 5 SQL calls per page if no custom appearance is
specified.

This eliminates many potential duplicate FindCommit RPCs for the same
ref, which often occurs in the RelativeLinkFilter#current_commit call.
On the GitLab 12.0 release post, for example, this would save close to
400 RPC calls.

References:

- https://www.npmjs.com/advisories/803
- https://hackerone.com/reports/344595Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

[ci skip]