MINOR: Disable testShareGroupMaxSizeConfigExceeded and mark testAcknowledgementCommitCallbackThrowsException as Flaky (#20786)

Disabling the test to prevent flakiness in build.  Complete analysis @
https://issues.apache.org/jira/browse/KAFKA-19840.

Reviewers: Andrew Schofield <[email protected]>

Author: sjhajharia

clients/clients-integration-tests/src/test/java/org/apache/kafka/clients/consumer/ShareConsumerTest.java

@@ -58,6 +58,7 @@
 import org.apache.kafka.common.test.api.ClusterConfigProperty;
 import org.apache.kafka.common.test.api.ClusterTest;
 import org.apache.kafka.common.test.api.ClusterTestDefaults;
+import org.apache.kafka.common.test.api.Flaky;
 import org.apache.kafka.common.test.api.Type;
 import org.apache.kafka.common.utils.Utils;
 import org.apache.kafka.coordinator.group.GroupConfig;
@@ -66,6 +67,7 @@
 import org.apache.kafka.test.TestUtils;
 
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Timeout;
 
@@ -1619,6 +1621,7 @@ public void onComplete(Map<TopicIdPartition, Set<Long>> offsetsMap, Exception ex
      * Test to verify that the acknowledgement commit callback can throw an exception, and it is propagated
      * to the caller of poll().
      */
+    @Flaky("KAFKA-19840") // https://issues.apache.org/jira/browse/KAFKA-19840
     @ClusterTest
     public void testAcknowledgementCommitCallbackThrowsException() throws InterruptedException {
         alterShareAutoOffsetReset("group1", "earliest");
@@ -2333,6 +2336,7 @@ public void testComplexShareConsumer() throws Exception {
         verifyShareGroupStateTopicRecordsProduced();
     }
 
+    @Disabled("KAFKA-19840") // https://issues.apache.org/jira/browse/KAFKA-19840
     @ClusterTest(
         brokers = 1,
         serverProperties = {