Skip queryable encryption tests on standalone servers

Author: alcaeus

tests/ExamplesTest.php

@@ -360,6 +360,10 @@ public function testQueryableEncryptionExamples(string $file, string $expectedOu
 
         $this->skipIfServerVersion('<', '7.0.0', 'Queryable encryption tests require MongoDB 7.0 or later');
 
+        if (! $this->isReplicaSet()) {
+            $this->markTestSkipped('Encrypted collections are not supported on standalone');
+        }
+
         /* Ensure that the key vault, collection under test, and any metadata
          * collections are cleaned up before and after the example is run. */
         $this->dropCollection('test', 'coll', ['encryptedFields' => []]);