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

Add project_members controller when not signed in

Closes #40642

See merge request gitlab-org/gitlab-ce!15659

[ci skip]

Add link to Gitaly conversion

[ci skip]

See merge request gitlab-org/gitlab-ce!15666

This endpoint still has to be migrated, and this comment makes sure
everyone knows we are aware of this one.

[ci skip]

Update google.md to reflect changes in the new Google APIs Library

See merge request gitlab-org/gitlab-ce!15633

Pin seed-fu to 2.3.6 since 2.3.7 is broken and add a fixture file that uses seed-fu in the test env

Closes #40690

See merge request gitlab-org/gitlab-ce!15661

Fix broadcast message not showing up on login page

Closes #13634

See merge request gitlab-org/gitlab-ce!15578

Set an artificial $HOME for gitaly in test

See merge request gitlab-org/gitlab-ce!15614

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

See https://gitlab.com/gitlab-org/gitlab-ce/issues/40690 and
https://github.com/mbleigh/seed-fu/issues/123 for details.
Signed-off-by: Rémy Coutable <remy@rymai.me>

* master: (1794 commits)

Copy `KubernetesService` logic in `Clusters::Platforms::Kubernetes` to make it interchangeable. And implement a selector.

See merge request gitlab-org/gitlab-ce!15515

Multi-file editor dirty diff indicator

Closes #40046

See merge request gitlab-org/gitlab-ce!15423

Update installation.md with receive.advertisePushOptions

See merge request gitlab-org/gitlab-ce!14430

fix for special charecter in file names

Closes #40146

See merge request gitlab-org/gitlab-ce!15606

Count the commits directly

See merge request gitlab-org/gitlab-ce!15628

Only load branch names for protected branch checks

See merge request gitlab-org/gitlab-ce!15629

Resolve "Clone dropdown should not have a tooltip"

Closes #39455

See merge request gitlab-org/gitlab-ce!15334

Remove blank/empty flash messages caused by nil

Closes #40671

See merge request gitlab-org/gitlab-ce!15658