Revert "Re-enable ClientSideEncryptionExplicitEncryptionTest for serverless (#983)"

This reverts commit afc4575, as tests are still failing

JAVA-4623

Author: jyemin

driver-sync/src/test/functional/com/mongodb/client/AbstractClientSideEncryptionExplicitEncryptionTest.java

@@ -43,6 +43,7 @@
 import java.util.List;
 import java.util.Map;
 
+import static com.mongodb.ClusterFixture.isServerlessTest;
 import static com.mongodb.ClusterFixture.isStandalone;
 import static com.mongodb.ClusterFixture.serverVersionAtLeast;
 import static com.mongodb.client.Fixture.getDefaultDatabase;
@@ -72,6 +73,7 @@ public abstract class AbstractClientSideEncryptionExplicitEncryptionTest {
     public void setUp() {
         assumeTrue(serverVersionAtLeast(6, 0));
         assumeFalse(isStandalone());
+        assumeFalse(isServerlessTest());
 
         MongoNamespace dataKeysNamespace = new MongoNamespace("keyvault.datakeys");
         BsonDocument encryptedFields = bsonDocumentFromPath("encryptedFields.json");