Add workflow_run api + webhook (#33964)

Implements 
- https://docs.github.com/en/rest/actions/workflow-jobs?apiVersion=2022-11-28#list-jobs-for-a-workflow-run--code-samples
- https://docs.github.com/en/rest/actions/workflow-jobs?apiVersion=2022-11-28#get-a-job-for-a-workflow-run--code-samples
- https://docs.github.com/en/rest/actions/workflow-runs?apiVersion=2022-11-28#list-workflow-runs-for-a-repository
- https://docs.github.com/en/rest/actions/workflow-runs?apiVersion=2022-11-28#get-a-workflow-run
  - `/actions/runs` for global + user + org (Gitea only)
  - `/actions/jobs` for global + user + org + repository (Gitea only)
  - workflow_run webhook + action trigger
    - limitations
- workflow id is assigned to a string, this may result into problems in
strongly typed clients

Fixes
- workflow_job webhook url to no longer contain the `runs/<run>` part to
align with api
- workflow instance does now use it's name inside the file instead of
filename if set

Refactoring
- Moved a lot of logic from workflows/workflow_job into a shared module
used by both webhook and api

TODO
- [x] Verify Keda Compatibility
- [x] Edit Webhook API bug is resolved
 
Closes https://github.com/go-gitea/gitea/issues/23670
Closes https://github.com/go-gitea/gitea/issues/23796
Closes https://github.com/go-gitea/gitea/issues/24898
Replaces https://github.com/go-gitea/gitea/pull/28047 and is much more
complete

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/actions/run.go

@@ -166,6 +166,17 @@ func (run *ActionRun) GetPullRequestEventPayload() (*api.PullRequestPayload, err
 	return nil, fmt.Errorf("event %s is not a pull request event", run.Event)
 }
 
+func (run *ActionRun) GetWorkflowRunEventPayload() (*api.WorkflowRunPayload, error) {
+	if run.Event == webhook_module.HookEventWorkflowRun {
+		var payload api.WorkflowRunPayload
+		if err := json.Unmarshal([]byte(run.EventPayload), &payload); err != nil {
+			return nil, err
+		}
+		return &payload, nil
+	}
+	return nil, fmt.Errorf("event %s is not a workflow run event", run.Event)
+}
+
 func (run *ActionRun) IsSchedule() bool {
 	return run.ScheduleID > 0
 }