[fix][broker] pulsar admin stats internal with metadata command

[programmerahul]

Following command returns wrong metadata for compactedLedger (It returns the metadata of schemaLedger):
pulsar-admin topics stats-internal persistent://t/n/__change_events -m

To reproduce:

1. Run command: pulsar-admin topics stats-internal persistent://t/n/__change_events -m
2. Check the ensemble of schemaLedgers and compactedLedger from bookie and compare it with the output of above command.

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

[programmerahul]

@lhotari please review

[lhotari]

LGTM