Instance level option to set default "Custom CI configuration path"

Merged Mathieu Parent requested to merge sathieu/gitlab:gitlab_ci_path into master

What does this MR do?

Allow to override .gitlab-ci.yml at instance level.

Fixes: #20598 (closed)

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Does this MR meet the acceptance criteria?

Conformity

Performance and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team
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