Improve online runner check (#35722)

This PR moves "no online runner" warning to the runs list. 

A job's `runs-on` may contain expressions like `runs-on: [self-hosted,
"${{ inputs.chosen-os }}"]` so the value of `runs-on` may be different
in each run. We cannot check it through the workflow file.

<details>
  <summary>Screenshots</summary>

Before:

<img width="960" alt="3d2a91746271d8b1f12c8f7d20eba550"
src="https://github.com/user-attachments/assets/7a972c50-db97-49d2-b12b-c1a439732a11"
/>

After:

<img width="960" alt="image"
src="https://github.com/user-attachments/assets/fc076e0e-bd08-4afe-99b9-c0eb0fd2c7e7"
/>
</details>

This PR also splits `prepareWorkflowDispatchTemplate` function into 2
functions:
- `prepareWorkflowTemplate` get and check all of the workflows
- `prepareWorkflowDispatchTemplate` only prepare workflow dispatch
config for `workflow_dispatch` workflows.

---------

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

templates/repo/actions/runs_list.tmpl

@@ -16,6 +16,7 @@
 				</a>
 				<div class="flex-item-body">
 					<span><b>{{if not $.CurWorkflow}}{{$run.WorkflowID}} {{end}}#{{$run.Index}}</b>:</span>
+
 					{{- if $run.ScheduleID -}}
 						{{ctx.Locale.Tr "actions.runs.scheduled"}}
 					{{- else -}}
@@ -24,6 +25,13 @@
 						{{ctx.Locale.Tr "actions.runs.pushed_by"}}
 						<a href="{{$run.TriggerUser.HomeLink}}">{{$run.TriggerUser.GetDisplayName}}</a>
 					{{- end -}}
+
+					{{$errMsg := index $.RunErrors $run.ID}}
+					{{if $errMsg}}
+						<span class="flex-text-inline" data-tooltip-content="{{$errMsg}}">
+							{{svg "octicon-alert" 16 "text red"}}
+						</span>
+					{{end}}
 				</div>
 			</div>
 			<div class="flex-item-trailing">