fix: api error message (#38031)

Fix various abuses and mistakes

routers/api/v1/shared/runners.go

@@ -77,11 +77,7 @@ func getRunnerByID(ctx *context.APIContext, ownerID, repoID, runnerID int64) (*a
 
 	runner, err := actions_model.GetRunnerByID(ctx, runnerID)
 	if err != nil {
-		if errors.Is(err, util.ErrNotExist) {
-			ctx.APIErrorNotFound("Runner not found")
-		} else {
-			ctx.APIErrorInternal(err)
-		}
+		ctx.APIErrorAuto(err)
 		return nil, false
 	}