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

[vbotbuildovich]

https://buildkite.com/redpanda/vtools/builds/11879

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

test_id:    HighThroughputTest.test_add_and_decommission
status:     FAIL
run time:   2629.113 seconds

ValueError("invalid literal for int() with base 10: ''")
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 104, in wrapped
    r = f(self, *args, **kwargs)
  File "/home/ubuntu/redpanda/tests/rptest/redpanda_cloud_tests/high_throughput_test.py", line 1221, in test_add_and_decommission
    self._stage_add_and_decommission()
  File "/home/ubuntu/redpanda/tests/rptest/redpanda_cloud_tests/high_throughput_test.py", line 1251, in _stage_add_and_decommission
    self._patch_cluster_replicas(cluster_name, orig_replicas)
  File "/home/ubuntu/redpanda/tests/rptest/redpanda_cloud_tests/high_throughput_test.py", line 1165, in _patch_cluster_replicas
    wait_until(
  File "/usr/local/lib/python3.10/dist-packages/ducktape/utils/util.py", line 53, in wait_until
    raise e
  File "/usr/local/lib/python3.10/dist-packages/ducktape/utils/util.py", line 44, in wait_until
    if condition():
  File "/home/ubuntu/redpanda/tests/rptest/redpanda_cloud_tests/high_throughput_test.py", line 1166, in <lambda>
    lambda: cluster_ready_replicas(cluster_name) == replicas,
  File "/home/ubuntu/redpanda/tests/rptest/redpanda_cloud_tests/high_throughput_test.py", line 1144, in cluster_ready_replicas
    return int(
ValueError: invalid literal for int() with base 10: ''

[vbotbuildovich]

*https://buildkite.com/redpanda/vtools/builds/11890