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>

modules/structs/commit_status.go

@@ -16,26 +16,17 @@ const (
 	CommitStatusError CommitStatusState = "error"
 	// CommitStatusFailure is for when the CommitStatus is Failure
 	CommitStatusFailure CommitStatusState = "failure"
-	// CommitStatusWarning is for when the CommitStatus is Warning
-	CommitStatusWarning CommitStatusState = "warning"
-	// CommitStatusRunning is for when the CommitStatus is Running
-	CommitStatusRunning CommitStatusState = "running"
 )
 
 // NoBetterThan returns true if this State is no better than the given State
 func (css CommitStatusState) NoBetterThan(css2 CommitStatusState) bool {
-	switch css {
-	case CommitStatusError:
-		return true
-	case CommitStatusFailure:
-		return css2 != CommitStatusError
-	case CommitStatusWarning:
-		return css2 != CommitStatusError && css2 != CommitStatusFailure
-	case CommitStatusPending:
-		return css2 != CommitStatusError && css2 != CommitStatusFailure && css2 != CommitStatusWarning
-	default:
-		return css2 != CommitStatusError && css2 != CommitStatusFailure && css2 != CommitStatusWarning && css2 != CommitStatusPending
+	commitStatusPriorities := map[CommitStatusState]int{
+		CommitStatusError:   0,
+		CommitStatusFailure: 1,
+		CommitStatusPending: 2,
+		CommitStatusSuccess: 3,
 	}
+	return commitStatusPriorities[css] <= commitStatusPriorities[css2]
 }
 
 // IsPending represents if commit status state is pending
@@ -57,8 +48,3 @@ func (css CommitStatusState) IsError() bool {
 func (css CommitStatusState) IsFailure() bool {
 	return css == CommitStatusFailure
 }
-
-// IsWarning represents if commit status state is warning
-func (css CommitStatusState) IsWarning() bool {
-	return css == CommitStatusWarning
-}