Enable accessible_code_owners_validation feature by default

Joe Woodwardrequested to merge
chore/default-true-code-owner-validations into master

What does this MR do and why?

Enable accessible_code_owners_validation feature by default

Prior to this change we validated the syntax of CODEOWNERS files. We now also validate the user and group permissions including

  1. If users and groups are accessible to the project.
  2. If users can approve MRs within the project
  3. If groups have a max role limit of at least developer
  4. If the valid groups contain at least one member who can approve merge requests

Related to Improved CODEOWNERS Validation (&15598), Inaccessible Code Owner validation (#429261 - closed), Group Max Role validation (#521151 - closed), Group Users Permission Validation (#521152 - closed), Validate users permissions in CODEOWNERS (#502583 - closed), [Feature flag] Rollout of `accessible_code_owne... (#524437 - closed)

Changelog: added

EE: true

Edited by Joe Woodward

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