Always return TransactionTooLarge rather than BSONObjectTooLarge when transaction is too large to fit in a single applyOps

We should backport the moving of the try clause in onTransactionCommit up to also cover the opsArray.done() call since it is possible for that call to throw a BSONObjectTooLarge exception, as we do in SERVER-40790.

The call in question on the 4.0 branch is here: https://github.com/mongodb/mongo/blob/ed33d2f8e66cd907ef13ee162f6a1dac3ff25672/src/mongo/db/op_observer_impl.cpp#L918