[MongoDB Storage] Revert logic for bucket checksum pre-calculations

[rkistner]

#503 made some changes to optimize the compact process.

However, the changes were also used for bucket checksum pre-calculations, where the same logic does not work:

1. Checksum pre-calculations specifically need to be resumable after a process restart, while a compact process doesn't have to be.
2. The logic for pre-calcuations sometimes skipped buckets to process in the next batch, but the updated logic would not return the same buckets again.
3. No concurrent changes are performed during checksum pre-calculations, so buckets changing during processing is not relevant there.

This reverts checksum pre-calculations to work like it did before - we now use different queries for compacting versus checksum pre-calculations.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4fa98d2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 12 packages

Name	Type
@powersync/service-module-mongodb-storage	Patch
@powersync/service-schema	Patch
@powersync/service-module-mongodb	Patch
@powersync/service-module-mssql	Patch
@powersync/service-module-mysql	Patch
@powersync/service-module-postgres	Patch
@powersync/service-image	Patch
@powersync/service-core	Patch
@powersync/service-core-tests	Patch
@powersync/service-module-core	Patch
@powersync/service-module-postgres-storage	Patch
test-client	Patch

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