versioning flakes pt2 (temporalio#7473)

## What changed?
<!-- Describe what has changed in this PR -->
fixed some code to reduce versioning flakes, mainly:

[TestVersioning3FunctionalSuite/TestUnpinnedWorkflowWithRamp_ToUnversioned](https://github.com/temporalio/temporal/actions/runs/13818885947/job/38659266639)
(with_logger data-race ✅)


[TestWorkerDeploymentSuite/TestSetWorkerDeploymentRampingVersion_Unversioned_VersionedCurrent](https://github.com/temporalio/temporal/actions/runs/13818885947/job/38659261367)
( context timeout - maybe fixed by having a separate go-routine ✅ )


[TestDeploymentVersionSuite/TestDrainageStatus_SetCurrentVersion_YesOpenWFs](https://github.com/temporalio/temporal/actions/runs/13818885947/job/38659258964)
(with_logger data-race ✅)

[TestVersioningFunctionalSuite/TestDispatchActivityFailCrossTq (retry
2)](https://github.com/temporalio/temporal/actions/runs/13712084173/job/38350437309)
(with_logger data-race ✅)


## Why?
<!-- Tell your future self why have you made these changes -->
- To stop these from appearing as flakes in the test reports.

## How did you test it?
<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
- Ran this locally with `-race` and now see no errors (errored out
previously)
- Ran this on CI a bunch of times without errors/flakes

## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->

## Documentation
<!-- Have you made sure this change doesn't falsify anything currently
stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->

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

Author: Shivs11

common/log/with_logger.go

@@ -49,7 +49,11 @@ func newWithLogger(logger Logger, tags ...tag.Tag) *withLogger {
 }
 
 func (l *withLogger) prependTags(tags []tag.Tag) []tag.Tag {
-	return append(l.tags, tags...)
+	allTags := make([]tag.Tag, len(l.tags)+len(tags))
+	copy(allTags, l.tags)
+	copy(allTags[len(l.tags):], tags)
+
+	return allTags
 }
 
 // Debug writes message to the log (if enabled).

tests/worker_deployment_test.go

@@ -1037,7 +1037,8 @@ func (s *WorkerDeploymentSuite) TestSetWorkerDeploymentRampingVersion_Unversione
 	defer cancel()
 	tv := testvars.New(s)
 	currentVars := tv.WithBuildIDNumber(1)
-	s.pollFromDeployment(ctx, currentVars)
+
+	go s.pollFromDeployment(ctx, currentVars)
 	s.ensureCreateVersionInDeployment(currentVars)
 
 	// check that the current version's task queues have ramping version == ""