Fix TestActionsCollaborativeOwner (#36657)

In #32562, I incorrectly assigned mismatched `repo_id` values to the
`action_run` and `action_run_job` fixtures used in
`TestActionsCollaborativeOwner`. The changes introduced in #36173 will
cause the test to fail. This PR removes the incorrect fixtures and
switches to using mock workflows to test the relevant functionality.

models/fixtures/action_run.yml

@@ -139,26 +139,7 @@
   updated: 1683636626
   need_approval: 0
   approved_by: 0
--
-  id: 804
-  title: "use a private action"
-  repo_id: 60
-  owner_id: 40
-  workflow_id: "run.yaml"
-  index: 189
-  trigger_user_id: 40
-  ref: "refs/heads/master"
-  commit_sha: "6e64b26de7ba966d01d90ecfaf5c7f14ef203e86"
-  event: "push"
-  trigger_event: "push"
-  is_fork_pull_request: 0
-  status: 1
-  started: 1683636528
-  stopped: 1683636626
-  created: 1683636108
-  updated: 1683636626
-  need_approval: 0
-  approved_by: 0
+
 -
   id: 805
   title: "update actions"

models/fixtures/action_run_job.yml

@@ -129,20 +129,7 @@
   status: 5
   started: 1683636528
   stopped: 1683636626
--
-  id: 205
-  run_id: 804
-  repo_id: 6
-  owner_id: 10
-  commit_sha: 6e64b26de7ba966d01d90ecfaf5c7f14ef203e86
-  is_fork_pull_request: 0
-  name: job_2
-  attempt: 1
-  job_id: job_2
-  task_id: 48
-  status: 1
-  started: 1683636528
-  stopped: 1683636626
+
 -
   id: 206
   run_id: 805

models/fixtures/action_task.yml

@@ -177,26 +177,7 @@
   log_length: 0
   log_size: 0
   log_expired: 0
--
-  id: 55
-  job_id: 205
-  attempt: 1
-  runner_id: 1
-  status: 6 # 6 is the status code for "running"
-  started: 1683636528
-  stopped: 1683636626
-  repo_id: 6
-  owner_id: 10
-  commit_sha: 6e64b26de7ba966d01d90ecfaf5c7f14ef203e86
-  is_fork_pull_request: 0
-  token_hash: b8d3962425466b6709b9ac51446f93260c54afe8e7b6d3686e34f991fb8a8953822b0deed86fe41a103f34bc48dbc478422b
-  token_salt: ERxJGHvg3I
-  token_last_eight: 182199eb
-  log_filename: collaborative-owner-test/1a/49.log
-  log_in_storage: 1
-  log_length: 707
-  log_size: 90179
-  log_expired: 0
+
 -
   id: 56
   attempt: 1