deleting hard coded taskrun controller name

GetRunType returns the unique ID for taskrun in the form of
TaskRunControllerName/address of *tr

TaskRun was hardcoded in this formula.

pkg/apis/pipeline/v1beta1/taskrun_types.go

@@ -414,7 +414,7 @@ func (tr *TaskRun) GetTimeout() time.Duration {
 // GetRunKey return the taskrun key for timeout handler map
 func (tr *TaskRun) GetRunKey() string {
 	// The address of the pointer is a threadsafe unique identifier for the taskrun
-	return fmt.Sprintf("%s/%p", "TaskRun", tr)
+	return fmt.Sprintf("%s/%p", pipeline.TaskRunControllerName, tr)
 }
 
 // IsPartOfPipeline return true if TaskRun is a part of a Pipeline.