Java: Add tests for names of nested classes

java/ql/test/query-tests/Telemetry/SupportedExternalApis/SupportedExternalApis.expected

@@ -7,5 +7,9 @@
 | java.net.URL#openStream() | 1 |
 | java.net.URLConnection#getInputStream() | 1 |
 | java.time.Duration#ofMillis(long) | 1 |
+| java.util.Iterator#next() | 1 |
+| java.util.Map#entrySet() | 1 |
 | java.util.Map#put(Object,Object) | 1 |
+| java.util.Map$Entry#getKey() | 1 |
+| java.util.Set#iterator() | 1 |
 | org.apache.commons.io.FileUtils#deleteDirectory(File) | 1 |

java/ql/test/query-tests/Telemetry/SupportedExternalApis/SupportedExternalApis.java

@@ -15,6 +15,7 @@ class SupportedExternalApis {
 
 		Map<String, Object> map = new HashMap<>(); // uninteresting (parameterless constructor)
 		map.put("foo", new Object()); // supported summary
+		map.entrySet().iterator().next().getKey(); // nested class (Map.Entry), supported summaries (entrySet, iterator, next, getKey)
 
 		Duration d = java.time.Duration.ofMillis(1000); // supported neutral