KMS support in the mongo shell was removed during 6.3 development along with its associated test. This was done because the tests presented significant reliability issues and the mongo shell has been deprecated since 5.0.

fle_drivers_integration.js has been notably flaky in the 6.0 and 5.0 branches lately, resulting in hot BFs. Removing just this test allows us to retain the KMS code and other non-flaky tests for now on these branches.