OTEL omit redundant persistence blobs (#7212)

## What changed?
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Omitting redundant persistence data blobs.

## Why?
<!-- Tell your future self why have you made these changes -->

Since the original data is already there, serializing the blobs is not
useful. Removing it reduces noise.

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

## 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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common/persistence/persistence_interface.go

@@ -438,9 +438,9 @@ type (
 		RunID       string
 
 		ExecutionInfo      *persistencespb.WorkflowExecutionInfo
-		ExecutionInfoBlob  *commonpb.DataBlob
+		ExecutionInfoBlob  *commonpb.DataBlob `json:"-"` // redundant in JSON
 		ExecutionState     *persistencespb.WorkflowExecutionState
-		ExecutionStateBlob *commonpb.DataBlob
+		ExecutionStateBlob *commonpb.DataBlob `json:"-"` // redundant in JSON
 		NextEventID        int64
 		StartVersion       int64
 		LastWriteVersion   int64
@@ -476,9 +476,9 @@ type (
 		RunID       string
 
 		ExecutionInfo      *persistencespb.WorkflowExecutionInfo
-		ExecutionInfoBlob  *commonpb.DataBlob
+		ExecutionInfoBlob  *commonpb.DataBlob `json:"-"` // redundant in JSON
 		ExecutionState     *persistencespb.WorkflowExecutionState
-		ExecutionStateBlob *commonpb.DataBlob
+		ExecutionStateBlob *commonpb.DataBlob `json:"-"` // redundant in JSON
 		StartVersion       int64
 		LastWriteVersion   int64
 		NextEventID        int64