MultiOperation handler refactoring (#7025)

## What changed?
<!-- Describe what has changed in this PR -->

Refactored MultiOperation handler. Based on
#7018.

## Why?
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Code hygiene.

## How did you test it?
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test? Checked in staging env? -->

Existing tests. There are no (intended) behavior changes.

## Potential risks
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change to production? -->

## Documentation
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stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->

## Is hotfix candidate?
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service/history/api/create_workflow_util.go

@@ -54,7 +54,11 @@ type (
 		RunID            string
 		LastWriteVersion int64
 	}
-	CreateOrUpdateLeaseFunc func(WorkflowLease, shard.Context, workflow.MutableState) (WorkflowLease, error)
+	CreateOrUpdateLeaseFunc func(
+		WorkflowLease,
+		shard.Context,
+		workflow.MutableState,
+	) (WorkflowLease, error)
 )
 
 func NewWorkflowWithSignal(