Remove commit status running and warning to align GitHub (#25839)

Fix #25776. Close #25826.

In the discussion of #25776, @wolfogre's suggestion was to remove the
commit status of `running` and `warning` to keep it consistent with
github.

references:
-
https://docs.github.com/en/rest/commits/statuses?apiVersion=2022-11-28#about-commit-statuses


## ⚠️ BREAKING ⚠️

So the commit status of Gitea will be consistent with GitHub, only
`pending`, `success`, `error` and `failure`, while `warning` and
`running` are not supported anymore.

---------

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

services/convert/status.go

@@ -52,6 +52,14 @@ func ToCombinedStatus(ctx context.Context, statuses []*git_model.CommitStatus, r
 			retStatus.State = status.State
 		}
 	}
+	// According to https://docs.github.com/en/rest/commits/statuses?apiVersion=2022-11-28#get-the-combined-status-for-a-specific-reference
+	// > Additionally, a combined state is returned. The state is one of:
+	// > failure if any of the contexts report as error or failure
+	// > pending if there are no statuses or a context is pending
+	// > success if the latest status for all contexts is success
+	if retStatus.State.IsError() {
+		retStatus.State = api.CommitStatusFailure
+	}
 
 	return retStatus
 }