Code Formats, Nits & Unused Func/Var deletions (#15286)

* _ to unused func options

* rm useless brakets

* rm trifial non used models functions

* rm dead code

* rm dead global vars

* fix routers/api/v1/repo/issue.go

* dont overload import module

modules/queue/unique_queue_disk.go

@@ -59,7 +59,7 @@ func NewLevelUniqueQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue,
 	return queue, nil
 }
 
-var _ (UniqueByteFIFO) = &LevelUniqueQueueByteFIFO{}
+var _ UniqueByteFIFO = &LevelUniqueQueueByteFIFO{}
 
 // LevelUniqueQueueByteFIFO represents a ByteFIFO formed from a LevelUniqueQueue
 type LevelUniqueQueueByteFIFO struct {