fix: ensure logical regions are synced during region sync

[WenyXu]

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Refer to a related PR or issue link (optional)

#5739

What's changed and what's your intention?

This PR makes the metric engine region sync to properly handle logical regions synchronization. Previously, logical regions were not being synchronized even when the metadata manifest version was updated. Now, when metadata_synced is true, the system correctly recovers states from the metadata region and syncs logical regions.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[fengjiachun]

Others LGTM