- Includes fix to stay in GitLab on MRs

- Adding link to docs in sourcegraph config UI
- Update docs to include opt-in flow

```---------
DB Migration
```

---------

This commit contains a DB migration adding the following fields:

- `applicaiton_settings::sourcegraph_public_only` this is helpful for
managing the difference between self-hosted and gitlab.com, where on
.com Sourcegraph is not authorized to see private projects, but in a
self-hosted instance, it's based on the authentication token they
preconfigure with their private sourcegraph instance.

- `user_preferences::sourcegraph_enabled` this is used to determine
if the user has opted in for sourcegraph or not.

------------
Feature flag
------------

Example:

```
Feature.enable(:sourcegraph, Project.find_by_full_path('lorem/ipsum'))
```

It is possible to conditionally apply this feature flag, so that the
bundle is only loaded on certain projects. This makes showing the admin
(or user) settings based on this flag difficult since there is no project
or group in scope for these views. For this reason, we've introduced the
`Gitlab::Sourcegraph` module to encapsulate whether a feature is
available (conditionally or globally).

How?

Conditional or global enablement can be tested with:

```
!Feature.get(:sourcegraph).off?
```

https://github.com/jnunemaker/flipper/blob/fa78a0030c7f139aecc3f9c8468baf9fd1498eb9/lib/flipper/feature.rb#L223

----
Also
----

The bundle is only loaded in project routes (potential for further optimization here)

- Initial draft

Document port value for CI_REGISTRY

Closes #36359

See merge request gitlab-org/gitlab!20149

Remove var from new_branch_form.js

See merge request gitlab-org/gitlab!20099

Resolve "Remove IIFEs from branch_graph.js"

Closes #34607

See merge request gitlab-org/gitlab!20008

Docs: Update docs with new approval rule screenshot

See merge request gitlab-org/gitlab!18972

Customizable cycle analytics - Persist custom stages

See merge request gitlab-org/gitlab!18372

Adds vuex actions to create a custom cycle
cycle analytics stage using the new
/-/analytics/cycle_analytics/stages endpoint

Authenticate with CI_JOB_TOKEN to NPM registry

Closes #9104

See merge request gitlab-org/gitlab!19059

- Allow NPM upload to use Job tokens
- Modify token matching to delay raising
  exception so that all methods are tried
- Change job token matching to include oauth bearer

Merge branch '12881-security-dashboard-leveraging-sparklines-to-show-vulnerability-trends' into 'master'

Vulnerabilities history chart - use sparklines

See merge request gitlab-org/gitlab!19745

This commit swaps the line chart with a series of sparkline charts
and additional information (severity level, count of current
vulnerabilities per level)

Add id_before, id_after filter param to projects API

See merge request gitlab-org/gitlab!19949

Add E2E test of broken images on welcome page

See merge request gitlab-org/gitlab!19924

Tests that any img tags have images that load successfully

See https://gitlab.com/gitlab-org/gitlab/issues/34768

GraphQL: Create MR mutations needed for the sidebar

See merge request gitlab-org/gitlab!19913

Change the default concurrency on merge train

Closes #31692

See merge request gitlab-org/gitlab!20201

Add license management via merge request spec

Closes gitlab-org/quality/testcases#141 and gitlab-org/quality/testcases#140

See merge request gitlab-org/gitlab!19771

This adds two new filters to the projects endpoint. It is a preparation
for keyset pagination on the id column - so why not implement this as a
standard filtering option if you have to support it anyways?

This commit changes the default concurrency on merge train

Resolve "Misleading input controller for dates"

Closes #27464

See merge request gitlab-org/gitlab!20183

Resolve "Extend audit events API for GitLab.com"

See merge request gitlab-org/gitlab!19868

Remove var from line_highlighter.js

See merge request gitlab-org/gitlab!20108

Remove merge_request specific code from Relation Factory

See merge request gitlab-org/gitlab!19825

Ensure milestone titles are never empty

See merge request gitlab-org/gitlab!19985

Geo - Scheduling the design repositories sync

See merge request gitlab-org/gitlab!19890

Ran `gitlab:graphql:schema:dump` as well as
`gitlab:graphql:compile_docs`

Resolve "Artifact-based view for Junit XML Documentation"

Closes #36073

See merge request gitlab-org/gitlab!19895

Added some documentation inside Junit docs
Added screenshot