Refactor commit status for Actions jobs (#23786) (#24060)

Backport #23786

Refactor commit status for Actions jobs (#23786)

Highlights:
- Treat `StatusSkipped` as `CommitStatusSuccess` instead of
`CommitStatusFailure`, so it fixed #23599.
- Use the bot user `gitea-actions` instead of the trigger as the creator
of commit status.
- New format `<run_name> / <job_name> / (<event>)` for the context of
commit status to avoid conflicts.
- Add descriptions for commit status.
- Add the missing calls to `CreateCommitStatus`.
- Refactor `CreateCommitStatus` to make it easier to use.

Co-authored-by: Jason Song <i@wolfogre.com>

routers/api/actions/runner/utils.go

@@ -14,6 +14,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	secret_module "code.gitea.io/gitea/modules/secret"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/services/actions"
 
 	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
 	"google.golang.org/protobuf/types/known/structpb"
@@ -28,6 +29,8 @@ func pickTask(ctx context.Context, runner *actions_model.ActionRunner) (*runnerv
 		return nil, false, nil
 	}
 
+	actions.CreateCommitStatus(ctx, t.Job)
+
 	task := &runnerv1.Task{
 		Id:              t.ID,
 		WorkflowPayload: t.Job.WorkflowPayload,