Skip queryable encryption tests on standalone servers (#1132)

* Skip queryable encryption tests on standalone servers

* Use consistent skip message for QE tests

Co-authored-by: Jeremy Mikola <jmikola@gmail.com>

---------

Co-authored-by: Jeremy Mikola <jmikola@gmail.com>

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->isStandalone()) {
+            $this->markTestSkipped('Queryable encryption requires replica sets');
+        }
+
         /* 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' => []]);