SERVER-71287 changed the behavior of verifyDbAndCollection() to throw a WriteConflictException rather than SnapshotUnavailable when there is a write request.

This means acquireCollection() and AutoGetCollection() can both throw WriteConflictException when establishing a collection snapshot. 

There are several places in the code that don't wrap acquireCollection() in a writeConflictRetry(), but use writeConflictRetry() in the lines following the acquisition.