doc: add missing runner audit events
What does this MR do and why?
doc: add missing runner audit events
- /ee/config/audit_events/types/register_runner.yml
- /ee/config/audit_events/types/unregister_runner.yml
- /ee/config/audit_events/types/assign_runner.yml
- /ee/config/audit_events/types/unassign_runner.yml
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