Modify unique constraint of table harbor_label in pgsql (#4811)
Modify unique constraint of table harbor_label in pgsql (#4811)

Add unique constraint to column name, scope and project_id of table harbor_label to make creating same name labels under different projects valid
wy65701436/harbor,steven-zou/harbor,wy65701436/harbor,reasonerjt/harbor,reasonerjt/harbor,reasonerjt/harbor,steven-zou/harbor,steven-zou/harbor,steven-zou/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,steven-zou/harbor,steven-zou/harbor,reasonerjt/harbor,reasonerjt/harbor,reasonerjt/harbor,wy65701436/harbor