Add opt-in "I'd like to receive updates via email" checkbox

Closes #2447

See merge request !2623

EE: Don't include anything to Kernel only because of tasks

See merge request !2630

update CE to EE update guide for 9.5

See merge request !2639

Resolve "Rebase not working with forked projects in 9.4.2"

Closes #3071

See merge request !2640

[EE] Prevent user from changing username with container registry tags

See merge request !2634

[EE] Enable the Layout/SpaceBeforeBlockBraces cop

See merge request !2638

CE to EE: Expose more attributes ee

See merge request !2642

We pass the service's `project` as an env var when pushing, so that we can do
access checks. As we are pushing to the source project, that should be our
context for rebasing.

In gitlab-org/gitlab-ce!13283 extra properties were added to
BasicProjectDetails. This entity is used by the Board entity and the
API boards spec verifies the JSON schema for the
`/projects/:id/boards` endpoint.

So add the extra properties to the schema file.

A better solution would have been to extract the project into a
separate file. But that is outside the current scope.

This also correctly fixes the conflict introduced in 3c8b2ae1, and
resolved in 55a5f2ab49.

Add migrations to enhance the association between Namespaces and GL.com plans

Closes #2391

See merge request !2609

Ports style changes fixed in a conflict in ce to ee upstream to master for new projects page

See merge request !2637

Signed-off-by: Rémy Coutable <remy@rymai.me>

Enable Jenkins integration for Early Adopter plan

See merge request !2622

Add a note about where Geo stores its log files

See merge request !2631

Add rubocop-gitlab-security gem

See merge request !2558

[ci skip]

* We shouldn't include utility methods everywhere
* Just extend main, rather than include to Kernel

[EE] Incorporate Gitaly's CommitService.FindCommit RPC

See merge request !2532

Spread load across all nodes in an elasticsearch cluster

Closes #2911

See merge request !2625