[improve][broker] Add logging when MetadataStoreTableViewImpl cache and tableview are out of sync (ExtensibleLoadManagerImpl only)

[heesung-sohn]

Motivation

#24478 introduced tableview refresh logic when a metadata session is reestablished. For better debugging, we better print warn log in case the cache and tableview record are out-of-sync(not expected)

Modifications

• added warn logs when the cache and tableview record in MetadataStoreTableViewImpl are out-of-sync
• minor bug fix in the test code

Verifying this change

• Make sure that the change passes the CI checks.

Does this pull request potentially affect one of the following parts:

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

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

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