KAFKA-8800: Increase poll timeout in poll[Records]UntilTrue (#7211)

If retrieving metadata during `poll(Duration)` repeatedly takes longer than the
poll timeout, we don't make progress and `waitUntilTrue` eventually times out
causing the test to fail. This behaviour differs from the older `poll(long)` that
would block until metadata retrieval had completed. The flakiness was likely
introduced when we switched from the latter to the former.

Reviewers: Ismael Juma <ismael@juma.me.uk>

core/src/test/scala/unit/kafka/utils/TestUtils.scala

@@ -769,7 +769,7 @@ object TestUtils extends Logging {
                     msg: => String,
                     waitTimeMs: Long = JTestUtils.DEFAULT_MAX_WAIT_MS): Unit = {
     waitUntilTrue(() => {
-      consumer.poll(Duration.ofMillis(50))
+      consumer.poll(Duration.ofMillis(100))
       action()
     }, msg = msg, pause = 0L, waitTimeMs = waitTimeMs)
   }
@@ -779,7 +779,7 @@ object TestUtils extends Logging {
                                  msg: => String,
                                  waitTimeMs: Long = JTestUtils.DEFAULT_MAX_WAIT_MS): Unit = {
     waitUntilTrue(() => {
-      val records = consumer.poll(Duration.ofMillis(50))
+      val records = consumer.poll(Duration.ofMillis(100))
       action(records)
     }, msg = msg, pause = 0L, waitTimeMs = waitTimeMs)
   }