* master: (154 commits)
  Don't disable the Rails mailer when seeding the test environment
  Documentation bug fixes: Added procedure to disable built-in Issues.
  Ensure `Namespace`'s is namespaced in `Gitlab::Kubernetes::Helm#initialize` and fix a transient failing spec due to that
  Add changelog entry
  Show only group name by default and put full namespace in tooltip
  Adds validation for Project#ci_config_path not to contain leading slash
  Gracefully handle case when repository's root ref does not exist
  Set EE variable
  issue note store
  allow caching options to be specified for counting services
  Update CHANGELOG.md for 10.2.3
  Add link to gitaly converation
  Fix pipeline config source specs and test it explicitly
  Set an artificial $HOME for gitaly in test
  Add a fixture file that uses seed-fu in the test env so that a borken seed-fu is detected
  Pin seed-fu to 2.3.6 since 2.3.7 is broken
  Do not set pipeline source after initialization
  updated diff spec
  fix for special charecter in file names
  We could simply count the commits
  ...

Don't disable the Rails mailer when seeding the test environment

See merge request gitlab-org/gitlab-ce!15690

Documentation bug fixes: Added procedure to disable built-in Issues.

See merge request gitlab-org/gitlab-ce!15581

Merge branch '40746-broken-master-due-to-failure-in-spec-services-clusters-applications-schedule_installation_service_spec-rb' into 'master'

Ensure `Namespace`'s is namespaced in `Gitlab::Kubernetes::Helm#initialize` and fix a transient failing spec due to that

Closes #40746

See merge request gitlab-org/gitlab-ce!15684

Ensure `Namespace`'s is namespaced in `Gitlab::Kubernetes::Helm#initialize` and fix a transient failing spec due to that
Signed-off-by: Rémy Coutable <remy@rymai.me>

Show only group name by default and put full namespace in tooltip in Groups tree

Closes #40286

See merge request gitlab-org/gitlab-ce!15650

Extract class responsible for building a pipeline

Closes #38460

See merge request gitlab-org/gitlab-ce!14762

Adds validation for Project#ci_config_path not to contain leading slash

Closes #34683

See merge request gitlab-org/gitlab-ce!15672

Gracefully handle case when repository's root ref does not exist

Closes #40615

See merge request gitlab-org/gitlab-ce!15678

Set EE variable for package build triggers from GitLab EE repository

Closes omnibus-gitlab#3006

See merge request gitlab-org/gitlab-ce!15677

This was failing regularly with an Error 500 when the API branches endpoint
was used.

Closes #40615

Clean up Capybara configuration

Closes #40599

See merge request gitlab-org/gitlab-ce!15644

issue note store

See merge request gitlab-org/gitlab-ce!15657

Align Select2 search field

Closes #39451

See merge request gitlab-org/gitlab-ce!15048

allow caching options to be specified for counting services

See merge request gitlab-org/gitlab-ce!15651

Improve require input spec

See merge request gitlab-org/gitlab-ce!15654