Disable G1 test on 21+

Author: trask

agent/agent-gc-monitor/gc-monitor-tests/src/test/java/com/microsoft/gcmonitortests/VariousCollectorsTest.java

@@ -6,6 +6,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.condition.JRE.JAVA_11;
 import static org.junit.jupiter.api.condition.JRE.JAVA_13;
+import static org.junit.jupiter.api.condition.JRE.JAVA_17;
 import static org.junit.jupiter.api.condition.OS.LINUX;
 
 import com.microsoft.gcmonitor.GcCollectionEvent;
@@ -33,6 +34,7 @@ void testParallel() throws Exception {
   }
 
   @Test
+  @EnabledForJreRange(max = JAVA_17)
   void testG1() throws Exception {
     testGc("-XX:+UseG1GC", 50);
   }
@@ -42,7 +44,7 @@ void testSerial() throws Exception {
     testGc("-XX:+UseSerialGC", 50);
   }
 
-  @Disabled
+  @Disabled // see https://github.com/microsoft/ApplicationInsights-Java/pull/3083
   @Test
   @EnabledForJreRange(min = JAVA_11)
   void testShenandoah() throws Exception {