The ClientSideEncryptionExternalKeyVaultTest intermittently fails due to a document validation error caused by residual test state from another test.

Details:

• Restarting occasionally resolves the issue.
• The error occurs when the ClientSideEncryptionExternalKeyVaultTest interacts with a collection (db.coll) whose validator was configured by a previous test (CrudProseTest).
• Document validation fails citing field "x" (type String), which is not defined in the schema of ClientSideEncryptionExternalKeyVaultTest.
• The issue is linked to a lack of cleanup after CrudProseTest.