Allow nil for remaining CI CD settings

See merge request gitlab-org/gitlab!64472

Fix Vale issues for planned_failover_single_node.md

See merge request gitlab-org/gitlab!63128

Refactor expired SSH key error messages

See merge request gitlab-org/gitlab!64519

Fix Vale issues for planned_failover_multi_node.md

See merge request gitlab-org/gitlab!63126

Move MR pipeline docs to pipelines-related dir

See merge request gitlab-org/gitlab!64998

Add mailgun application settings for receiving email send failures

See merge request gitlab-org/gitlab!64249

doc: Warn for support drop of postgresql 11 in version 14.0

See merge request gitlab-org/gitlab!64763

Includes predicates as methods to avoid returning nil instead of false

Also adds the tests to EE as a shared example

The remaining methods delegated to ci_cd_settings also caused error
500 when the CI CD settings are deleted but the project still exists.
This allows them to return nil instead of raising an error.

Changelog: fixed

Update gl-alert markup in file

See merge request gitlab-org/gitlab!63251

[RUN-AS-IF-FOSS] Add validate account modal from CI/CD shared runners page

See merge request gitlab-org/gitlab!64861

Removes pipeline_filter_jobs feature flag

See merge request gitlab-org/gitlab!64919

Fix Storage-specific configuration header depth

See merge request gitlab-org/gitlab!64864

Remove the usage_data_code_review_aggregation feature flag

See merge request gitlab-org/gitlab!64626

Remove agent dev docs

See merge request gitlab-org/gitlab!62433

Switch to GlCollapse component

See merge request gitlab-org/gitlab!64982

Improve Release documentation for generic package

See merge request gitlab-org/gitlab!64750

Add compliance_frameworks_with_pipeline to usage ping

See merge request gitlab-org/gitlab!64601

Adds a new usage ping counter to count the number of custom
compliance frameworks that have GitLab CI configuration
associated with it.

Changelog: added
EE: true

Disable RSpec option filter focus and run_all_when_everything_filtered on CI [RUN ALL RSPEC]

See merge request gitlab-org/gitlab!64986

Enable assumeImmutableResults to enforce immutability

See merge request gitlab-org/gitlab!64581

Enable assumeImmutableResults to force immutability in api fuzzing cofiguration

See merge request gitlab-org/gitlab!64583

Revise UI text for third-party offers

See merge request gitlab-org/gitlab!64943

Fix admin mode when authenticating with LDAP

See merge request gitlab-org/gitlab!64823

Redirect Shibboleth docs to SAML

See merge request gitlab-org/gitlab!64984