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Some WiredTiger operations require exclusive handles on objects to succeed (verify, alter, salvage, etc.), which requires no dirty data in the cache before an exclusive handle is granted.
Historic WiredTiger releases would individually checkpoint these objects, outside of a database-wide checkpoint, so exclusive access could be granted.
Checkpointing objects outside of a database-wide checkpoint potentially leads to data inconsistencies (see ~~WT-8695~~), so checkpointing single objects was made an error.
That led to MDB Server test fallout, see ~~SERVER-63605~~ and ~~SERVER-64026~~.
Part of the ~~WT-8695~~ change was reverted, allowing single object checkpoints in MongoDB Server builds, while leaving them an error in standalone builds (see ~~WT-8883~~).
When ~~SERVER-64026~~ is closed, single object checkpoints should be disallowed in all builds.

depends on

SERVER-64726 Modify db_catalog_test to account for EBUSY errors

SERVER-64026 Update WT operations that require exclusive access to a dhandle

is related to

WT-8695 Remove file_close_sync config and disallow single file checkpoint

WT-8883 Change to disallow single file checkpoint has MDB server fallout

SERVER-63605 validate_tests fails after some WT changes