Support org labels when adding labels by label names (#32988)

Fix #32891

(cherry picked from commit 44b4fb21a4e99f327303f66cc7e48f7ca7ba09e1)

models/fixtures/label.yml

@@ -96,3 +96,14 @@
   num_issues: 0
   num_closed_issues: 0
   archived_unix: 0
+
+-
+  id: 10
+  repo_id: 3
+  org_id: 0
+  name: repo3label1
+  color: '#112233'
+  exclusive: false
+  num_issues: 0
+  num_closed_issues: 0
+  archived_unix: 0

models/issues/label.go

@@ -353,6 +353,17 @@ func GetLabelIDsInRepoByNames(ctx context.Context, repoID int64, labelNames []st
 		Find(&labelIDs)
 }
 
+// GetLabelIDsInOrgByNames returns a list of labelIDs by names in a given org.
+func GetLabelIDsInOrgByNames(ctx context.Context, orgID int64, labelNames []string) ([]int64, error) {
+	labelIDs := make([]int64, 0, len(labelNames))
+	return labelIDs, db.GetEngine(ctx).Table("label").
+		Where("org_id = ?", orgID).
+		In("name", labelNames).
+		Asc("name").
+		Cols("id").
+		Find(&labelIDs)
+}
+
 // BuildLabelNamesIssueIDsCondition returns a builder where get issue ids match label names
 func BuildLabelNamesIssueIDsCondition(labelNames []string) *builder.Builder {
 	return builder.Select("issue_label.issue_id").