Disable flaky AudioKeepsFlowingAfterImplicitRollback test.

I don't quite understand why this is flaking but I beleive it is a
test-only problem, see description in https://crbug.com/webrtc/14947
how I have trouble understanding if "frames received" is measured
correctly.

Bug: webrtc:14947, webrtc:14909
Change-Id: I667306b7cd33687645ad6a9294364330075434ce
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/295700
Reviewed-by: Markus Handell <handellm@webrtc.org>
Auto-Submit: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39433}

pc/peer_connection_integrationtest.cc

@@ -3233,8 +3233,10 @@ TEST_P(PeerConnectionIntegrationTest, OnIceCandidateErrorWithEmptyAddress) {
   EXPECT_EQ(caller()->error_event().address, "");
 }
 
+// TODO(https://crbug.com/webrtc/14947): Investigate why this is flaking and
+// find a way to re-enable the test.
 TEST_F(PeerConnectionIntegrationTestUnifiedPlan,
-       AudioKeepsFlowingAfterImplicitRollback) {
+       DISABLED_AudioKeepsFlowingAfterImplicitRollback) {
   PeerConnectionInterface::RTCConfiguration config;
   config.sdp_semantics = SdpSemantics::kUnifiedPlan;
   config.enable_implicit_rollback = true;