Removed non-required helpers (temporalio#6465)

## What changed?
<!-- Describe what has changed in this PR -->
- removed helpers which were not being used

## Why?
<!-- Tell your future self why have you made these changes -->
- keeping code nice and clean

## How did you test it?
<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
- exiting CI/CD run

## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->
none

## Is hotfix candidate?
<!-- Is this PR a hotfix candidate or does it require a notification to
be sent to the broader community? (Yes/No) -->
- nope

tests/describe_task_queue.go

@@ -210,19 +210,6 @@ func (s *DescribeTaskQueueSuite) publishConsumeWorkflowTasksValidateStats(workfl
 	s.validateDescribeTaskQueue(tqName, expectedBacklogCount, maxBacklogExtraTasks, expectedAddRate, expectedDispatchRate, isEnhancedMode)
 }
 
-func (s *DescribeTaskQueueSuite) isBacklogHeadCreateTimeCorrect(actualBacklogAge time.Duration, expectEmptyBacklog bool) bool {
-	return expectEmptyBacklog == (actualBacklogAge == time.Duration(0))
-}
-
-func (s *DescribeTaskQueueSuite) isAddDispatchTasksRateCorrect(
-	actualAddTasksRate float32, actualDispatchTasksRate float32, expectAddRate, expectDispatchRate bool) bool {
-	return expectDispatchRate == (actualDispatchTasksRate != 0) && (expectAddRate == (actualAddTasksRate != 0))
-}
-
-func (s *DescribeTaskQueueSuite) isBacklogCountCorrect(actualBacklogCounter int64, expectedBacklogCount int64) bool {
-	return actualBacklogCounter == expectedBacklogCount
-}
-
 func (s *DescribeTaskQueueSuite) validateDescribeTaskQueue(
 	tq string,
 	expectedBacklogCount map[enumspb.TaskQueueType]int64,