enhance(actions): show the steps the runner reports (#39720)

Gitea derives the steps of a job from the workflow file, so the `pre`
and `post` steps of actions only show up inside "Set up job" and
"Complete job".
Fixes https://github.com/go-gitea/gitea/issues/24604.

A runner can now report the steps it actually runs, and Gitea shows
those instead. Runners that don't report them keep the current view, and
older Gitea versions ignore them.

Related:
- Proto: https://gitea.com/gitea/actions-proto-def/pulls/19
- Runner: https://gitea.com/gitea/runner/pulls/1293

modules/actions/task_state.go

@@ -17,6 +17,9 @@ func FullSteps(task *actions_model.ActionTask) []*actions_model.ActionTaskStep {
 	if len(task.Steps) == 0 {
 		return fullStepsOfEmptySteps(task)
 	}
+	if task.Steps[0].IsReported() {
+		return task.Steps // the runner reports its own setup and cleanup steps
+	}
 
 	// firstStep is the first step that has run or running, not include preStep.
 	// For example,