[Bug] Data race in scenario.go

[stephanos]

WARNING: DATA RACE
Read at #HEX by go routine: #DIG:
  github.com/temporalio/omes/loadgen.(*Run).ExecuteKitchenSinkWorkflow()
      /omes/loadgen/scenario.go:272 +0x984
  github.com/temporalio/omes/loadgen.FuzzExecutor.Run.func1()
      /omes/loadgen/fuzz_executor.go:84 +0x22b
  github.com/temporalio/omes/loadgen.(*genericRun).Run.func2()
      /omes/loadgen/generic_executor.go:133 +0xf1

Previous write at #HEX by go routine: #DIG:
  github.com/temporalio/omes/loadgen.(*Run).ExecuteKitchenSinkWorkflow.func1()
      /omes/loadgen/scenario.go:254 +0x15c

go routine: #DIG (running) created at:
  github.com/temporalio/omes/loadgen.(*genericRun).Run()
      /omes/loadgen/generic_executor.go:131 +0x86e
  github.com/temporalio/omes/loadgen.(*GenericExecutor).Run()
      /omes/loadgen/generic_executor.go:37 +0xcc
  github.com/temporalio/omes/loadgen.FuzzExecutor.Run()
      /omes/loadgen/fuzz_executor.go:87 +0xaac
  github.com/temporalio/omes/loadgen.(*FuzzExecutor).Run()
      <autogenerated>:1 +0x130
  main.(*scenarioRunner).run()
      /omes/cmd/run_scenario.go:158 +0xd8c
  main.(*workerWithScenarioRunner).run()
      /omes/cmd/run_scenario_with_worker.go:75 +0x76f
  main.runScenarioWithWorkerCmd.func1()
      /omes/cmd/run_scenario_with_worker.go:19 +0xac
  github.com/spf13/cobra.(*Command).execute()
      /go/pkg/mod/github.com/spf13/[email protected]/command.go:944 +0xe50
  github.com/spf13/cobra.(*Command).ExecuteC()
      /go/pkg/mod/github.com/spf13/[email protected]/command.go:1068 +0x617
  github.com/spf13/cobra.(*Command).Execute()
      /go/pkg/mod/github.com/spf13/[email protected]/command.go:992 +0x3f0
  main.main()
      /omes/cmd/main.go:26 +0x3f1

go routine: #DIG (finished) created at:
  github.com/temporalio/omes/loadgen.(*Run).ExecuteKitchenSinkWorkflow()
      /omes/loadgen/scenario.go:253 +0x84b
  github.com/temporalio/omes/loadgen.FuzzExecutor.Run.func1()
      /omes/loadgen/fuzz_executor.go:84 +0x22b
  github.com/temporalio/omes/loadgen.(*genericRun).Run.func2()
      /omes/loadgen/generic_executor.go:133 +0xf1

L254

clientActionsErr = executor.ExecuteClientSequence(cancelCtx, clientSeq)

L272

if clientActionsErr != nil {
	return fmt.Errorf("kitchen sink client actions failed: %w", clientActionsErr)
}