Run FOSS system tests and simplify dependencies

See merge request gitlab-org/gitlab!18222

* We also use `needs` to speed it up
* To simplify the dependencies, we also pull cache on master

Remove custom merge strategy for db/schema.rb

See merge request gitlab-org/gitlab!18406

Add API for manually creating deployments

Closes #25176 and #32579

See merge request gitlab-org/gitlab!17620

Feature #19822, users can preview audio in a repository.

See merge request gitlab-org/gitlab!18354

Change design management empty state button style

See merge request gitlab-org/gitlab!18060

https://gitlab.com/gitlab-org/gitlab/issues/13395

Fix links to all redirected blog posts

See merge request gitlab-org/gitlab!18586

Fix all links to blog posts to use the new
path of about.gitlab.com/blog

Adjust test to avoid flakiness

Closes #34144

See merge request gitlab-org/gitlab!18657

Correct validation backlog label name in issue template

See merge request gitlab-org/gitlab!18595

Add section about experiments

See merge request gitlab-org/gitlab!17538

This API can be used for manually creating deployments, instead of being
limited to creating deployments using CI pipelines.

As part of these changes, I refactored some parts of the existing
deployments code. This ensures we reuse the same logic for creating
deployments in different places. We also move the deployments service
classes to a Deployments namespace, now that there are two service
classes.

We also make some changes to which deployments are displayed. Prior to
these changes, only deployments that were successful were displayed.
This can get very confusing when using deployments from external
systems, so we now show deployments regardless of their status. The
table to display deployments has also had some style/content changes to
display the deployments data in a more meaningful way.

Add `on_before_phased_restart` lifecycle event

See merge request gitlab-org/gitlab!18582

Unicorn/Puma Cluster: This will be called before a graceful
shutdown of workers starts hapepning.
This is called on `master` process.

Support Create/Read/Destroy operations in Feature Flag API

See merge request gitlab-org/gitlab!18198

Fix caching of submodule links for shas with dashes

See merge request gitlab-org/gitlab!18576

Replace index on ci_triggers

See merge request gitlab-org/gitlab!18652

Resolve "Follow-up from "Handle tag delete 404""

Closes #34196

See merge request gitlab-org/gitlab!18641

Add additional scopes to note

See merge request gitlab-org/gitlab!18309

Add blackout period support for `web_exporter:`

See merge request gitlab-org/gitlab!17962

This introduces `#run_thread` method.

The `#start_working` is executed in lock context,
the same as `#stop_working`. This allows safe
initialisation of resources before `#run_thread`
consumes them.

Add Dismiss Vulnerability API call to Vulnerabilities API

See merge request gitlab-org/gitlab!18495

Vulnerabilities::DismissSerivce is responsible
for dismissal of Vulnerabilities and their
associated Findings (creation of dismissal
feedback records for all Findings
as a cascade.

Add Unicorn and Puma health checks

See merge request gitlab-org/gitlab!18592

Resolve "`review-deploy` fails due to a deprecation warning"

Closes #34207

See merge request gitlab-org/gitlab!18649

Relates to https://gitlab.com/gitlab-org/gitlab/issues/34188

This commit adds a public API support for FF

Expose subscribed attribute for epics on API

See merge request gitlab-org/gitlab!18475

Expose if user is subscribed to an epic when getting a
single epic from API.

- Dont skip deleting tags if any tag fails in the way
- Add specs to make sure all tags are being iterated over

Handle tag delete 404

Closes #32407

See merge request gitlab-org/gitlab!18303

Share JS code for all paths in trials

Closes #33740

See merge request gitlab-org/gitlab!18378

Adds login input with copy box and supporting copy to empty container registry view

Closes #32866

See merge request gitlab-org/gitlab!18244

Closes issue:
https://gitlab.com/gitlab-org/gitlab/issues/32866

Fix Web IDE tree not updating modified status

See merge request gitlab-org/gitlab!18647