Updated doc related to job concurrency

Closes #193484

See merge request gitlab-org/gitlab!22891

Allow apps to be installed without helm installed if local tiller enabled

See merge request gitlab-org/gitlab!22746

This means we can disregard whether Helm is installed or not

Move specs regarding set_initial_status to
cluster_application_initial_status.rb as not every application has the
common set_initial_status (elasticstack and jupyterhub)

Fix missing CERT_MANAGER_VALUES_FILE var

See merge request gitlab-org/gitlab!22939

Modify SpamService initializer

See merge request gitlab-org/gitlab!22874

Don't update user state on a read-only instance

Closes #195988

See merge request gitlab-org/gitlab!22928

LDAP authorization model on a Geo secondary tries
to block/unblock a user if he is blocked/unblocked
in LDAP raising a `PG::ReadOnlySqlTransaction` error.

Simplify test and make it run faster

See merge request gitlab-org/gitlab!22902

Un-quarantine E2E Secure dashboard test

See merge request gitlab-org/gitlab!22910

Replace set with let_it_be in EE specs

See merge request gitlab-org/gitlab!22794

Replace set to let_it_be in ee/spec/finders

See merge request gitlab-org/gitlab!22786

Add Elastic Stack documentation

See merge request gitlab-org/gitlab!22614

Add Elastic Stack documentationn

Add informational message about pagination thresholds to the Environments Dashboard page

Closes #39533

See merge request gitlab-org/gitlab!22489

Remove kibana from elastic stack

See merge request gitlab-org/gitlab!22780

we'll do our own interface

Display SHA fingerprint for Deploy Keys and extend api to query those

See merge request gitlab-org/gitlab!22665

The keys api endpoint used with the fingerprint parameter can be
used to query ssh keys. Until now, projects that are using the key
were not presented to the api consumer. Now those are visible as
well via the api endpoint

Fix broken master in spec/helpers/users_helper_spec.rb

Closes #196560

See merge request gitlab-org/gitlab!22930

Update feature flag documentation

See merge request gitlab-org/gitlab!22924

Simplify and shorten test code

See merge request gitlab-org/gitlab!22920

Shorten test code

See merge request gitlab-org/gitlab!22918

Simplify and shorten test code

See merge request gitlab-org/gitlab!22913

https://gitlab.com/gitlab-org/gitlab/merge_requests/20664 was behind
`master` by over 1200 commits when it was merged, and new tests for
badges were added since then. The merge request introduced a new badge
for EE licenses, but since CE installations don't have a concept of a
license, we just need to ignore these badges for the CE tests.

Closes https://gitlab.com/gitlab-org/gitlab/issues/196560

Use named parameters for clarity.

Add API support for retrieving deployed merge requests

See merge request gitlab-org/gitlab!21837

Refactored merge request API params into module.
Leveraged MergeRequestHelpers in Deployment API.
Updated Deployment API documentation.

Shorten test code

See merge request gitlab-org/gitlab!22912

Update d3 node module 4.13 -> 5.12

Closes #33944

See merge request gitlab-org/gitlab!20627

Add Multi destination logger

See merge request gitlab-org/gitlab!22341

This would allow for logging is different formats,
through single logger calls.

Also, add documentation for this logger.

Add column to store group ID in application_settings

See merge request gitlab-org/gitlab!22600

Migrations to add a column, foreign key constraint and index into
application_settings table.

Fix missing comma in the single merge request API docs

See merge request gitlab-org/gitlab!22836

Simplify trigger email notification test

See merge request gitlab-org/gitlab!22897

It's better to have the implementation details encapsulated in a
method that is called by the test than having all of it inside the
test itself. This way the `it` block gets cleaner and more focused.