Introduce `Runtime` class to uniformly identify the running process

Closes #36709

See merge request gitlab-org/gitlab!20294

This will serve as the new single access point into
identifying which runtime is active.

Add Process.max_threads method

This will return the maximum concurrency for the given
runtime environment.

Revert to including `defined?` checks for Process

This is based on a reference impl by new relic which they
use to detect the current dispatcher.

Add `name` method, throw if ambiguous

This can be called from an initializer for instance.

Log the current runtime in an initializer

Add `multi_threaded?` and `app_server?` helpers

To allow easier grouping of configuration

Rename `Process` to `Runtime`

And move it into its own file.

Replace all remaining runtime checks with new API

Including a commit body because the danger bot politely asked me
to. There really is nothing else to say.

Prefer `class << self` over `instance_eval`

It seems to be the more widely adopted style.

Simplify `has_instances?` helper method

Fix rubocop offense

Remove max_threads method

This wasn't currently used anywhere and we should define this elsewhere.

Remove references to NR library

This caused some legal questions. We weren't using the instance lookup
before, so it should be OK.

Replace end-to-end test by RSpec test

Closes #34936 and #35354

See merge request gitlab-org/gitlab!21410

The end-to-end test that deletes a group board is flaky, and so,
this change replaces it by an RSpec test.

Exclude shared projects from Group Security Dashboard filter

See merge request gitlab-org/gitlab!14667

Per default GitLab includes forks (shared projects) in the Groups
Project API. With `with_shared=false` we exclude those from the API
calls.

Update Hugo.gitlab-ci.yml template

See merge request gitlab-org/gitlab!20741

add sha256 fingerprint to SSH key view and api to query user by ssh fingerprint

See merge request gitlab-org/gitlab!19860

Do git gc, not repack, after moving a repository between shards

See merge request gitlab-org/gitlab!21502

Support diff version and whitespace arguments for diffs batch endpoint

See merge request gitlab-org/gitlab!20939

Proactively marking MRs in train as stale

Closes #12971 and #13001

See merge request gitlab-org/gitlab!19434

Rework pod logs navigation scheme

See merge request gitlab-org/gitlab!20578

Create a single logs route and API in preparation for more search
capabilities

Ensure HTML safety of new HSET/HMGET diffs cache

Closes #39104

See merge request gitlab-org/gitlab!21521

Block specifying a k8s namespace via CI template for managed clusters

See merge request gitlab-org/gitlab!21223

Respect snippet query params when displaying embed urls

Closes #35095 and #38015

See merge request gitlab-org/gitlab!21131

Update Bullet gem to 6.0.2

See merge request gitlab-org/gitlab!21477

Update eslint-plugin-import from 2.16.0 to 2.18.2 (the third iteration)

See merge request gitlab-org/gitlab!17476

Fork Puma to validate scheduler fixes

See merge request gitlab-org/gitlab!21547

This makes us to switch to use Puma from:
- https://gitlab.com/gitlab-org/gitlab-puma
- https://gitlab.com/gitlab-org/gitlab-puma_worker_killer

This is needed to test a latest latency improvements
for Puma to improve, Puma scheduling mechanism.

This is meant to be temporary as part of effort to upstream
the https://github.com/puma/puma/pull/2079

Allow create access Releases API via Job-Token

See merge request gitlab-org/gitlab!20632

Fixing "Push Rules" spec

Closes #34978

See merge request gitlab-org/gitlab!21489

CI template sentry application

See merge request gitlab-org/gitlab!21208

It extracts a method to be reused by all diff caches,
which ensures the rich_text of diff lines are
html safe. Otherwise we'd see a wrong state in
the diff changes tab.

Corrected expression to include correct quotes in ES Integration

See merge request gitlab-org/gitlab!21418

Never hide vulnerability modal footer

See merge request gitlab-org/gitlab!20867

the third iteration

separate method for unauthorized project messages

See merge request gitlab-org/gitlab!21451

Correct RepositoryUpdateMirrorWorker attribution

See merge request gitlab-org/gitlab!21541

Container registry expiration policy schema and models

See merge request gitlab-org/gitlab!20412

Migration to create container_expiration_policies
Add model with associations to project
Add helpers to provide drop down options for
container_expiration_policies
Autopopulate container_expiration_policy record
on project create

Authenticate runner requests in Rack::Attack

See merge request gitlab-org/gitlab!21311

We were looking only for users in throttle_unauthenticated requests.

Now we try to find also a runner with the provieded token if the
request is for the API.

The previous docker image used Hugo 0.54 and is no longer compatible
with a number of themes.
Signed-off-by: Paul Spooren <mail@aparcar.org>

Documents that jobs are returned DESC by ID in API

Closes gitlab-com/support/docs#39

See merge request gitlab-org/gitlab!21507

Add clarification for geo primary private ip

See merge request gitlab-org/gitlab!21398

feat: support omniauth for admin mode

See merge request gitlab-org/gitlab!18214

- Extend admin mode support to OmniAuth authentication
- Improve admin mode flow by adding a request step with a grace period