[Feature Flag] Remove create_runner_workflow_for_admin and create_runner_workflow_for_namespace

The two feature flags were enabled by default in %16.0 without issues, and can now be removed from the code in %16.1.

changed milestone to %16.1

added [Deprecated] Category:Runner Fleet devopsverify documentation feature flag grouprunner sectionci typemaintenance labels

assigned to @pedropombeiro

added workflowin dev label

mentioned in merge request !123785 (merged)

mentioned in issue gitlab-runner#29287 (closed)

Update 16 Jun 2023

What's left to be done:

Reviews

MRs

!123785 (merged)

added workflowin review label and removed workflowin dev label

changed health status to on track

changed health status to needs attention

changed milestone to %16.2

changed health status to on track

closed

removed workflowin review label