Conditional mocking of admin mode in specs by directory

What does this MR do?

Prepare to break !27405 (closed) in chunks by mocking admin mode in spec by directory.

• Keeps the :do_not_mock_admin_mode metadata and introduces a new :enable_admin_mode. The mocking of admin mode is still active like previously, but limited to a set of directories
• We'll break !27405 (closed) in multiple MRs that each tackle a subset of the directories, apply the changes in there to the specs and remove mocking of the relevant directories
• This approach also has the nice property of forcing new specs added outside of these directories to have to handle admin mode, as will be the case for all of them when the migration is finished

Related to #31511 (closed)

with at Siemens

/cc @bufferoverflow @rpaik @reprazent @ifarkas @rymai

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

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

mentioned in issue #31511 (closed)

added 1 commit

• 26cc88a9 - Refactor comments, add changelog

Compare with previous version

added 1 commit

• 06e78f6d - Conditional mocking of admin mode in specs based on directory

Compare with previous version

mentioned in merge request siemens/gitlab!17 (closed)

changed the description

unmarked as a Work In Progress

@rymai @reprazent This is ready for review

changed the description

added Community contribution customer labels

added devopsmanage groupauthentication and authorization [DEPRECATED] labels

assigned to @reprazent

approved this merge request

Thank you @dlouzan, this looks good to me!

@ifarkas would you have a moment for the maintainer review?

assigned to @ifarkas and unassigned @reprazent

resolved all threads

approved this merge request

enabled an automatic merge when the pipeline for 06e78f6d succeeds

Thanks @dlouzan, looks good to me too! MWPS set.

merged

mentioned in commit 924829f0

changed milestone to %12.10

mentioned in merge request !25321 (merged)

mentioned in commit 8cf109be

added workflowstaging label

added workflowcanary label and removed workflowstaging label

added workflowproduction label and removed workflowcanary label

mentioned in commit de437209

mentioned in commit 337f6309

mentioned in commit 64e6b1ec

mentioned in merge request siemens/gitlab!41 (closed)

mentioned in merge request !58530 (closed)

mentioned in merge request !107925 (merged)