CI Failure (key symptom) in `HighThroughputTest.test_decommission_and_add`

[vbotbuildovich]

https://buildkite.com/redpanda/vtools/builds/11414

Module: rptest.redpanda_cloud_tests.high_throughput_test
Class: HighThroughputTest
Method: test_decommission_and_add

test_id:    HighThroughputTest.test_decommission_and_add
status:     FAIL
run time:   894.777 seconds

AssertionError()
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/ducktape/tests/runner_client.py", line 184, in _do_run
    data = self.run_test()
  File "/usr/local/lib/python3.10/dist-packages/ducktape/tests/runner_client.py", line 269, in run_test
    return self.test_context.function(self.test)
  File "/home/ubuntu/redpanda/tests/rptest/services/cluster.py", line 82, in wrapped
    r = f(self, *args, **kwargs)
  File "/home/ubuntu/redpanda/tests/rptest/redpanda_cloud_tests/high_throughput_test.py", line 915, in test_decommission_and_add
    self.stage_decommission_and_add()
  File "/home/ubuntu/redpanda/tests/rptest/redpanda_cloud_tests/high_throughput_test.py", line 1058, in stage_decommission_and_add
    assert cluster_ready_replicas(cluster_name) == orig_replicas
AssertionError

[michael-redpanda]

*https://buildkite.com/redpanda/vtools/builds/11575_ignore

Removed this comment (and added _ignore prefix) because PT is getting confused between this and #16331.

[michael-redpanda]

Marking this ci-ignore so Pandatriage stops getting confused by this issue

[travisdowns]

I think we should just close this issue so that PT gets a chance to open a fresh one if it's still occurring.

WDYT @michael-redpanda ?