CI Failure (key symptom) in OMBValidationTest.test_max_connections

[vbotbuildovich]

https://buildkite.com/redpanda/vtools/builds/13942

Module: rptest.redpanda_cloud_tests.omb_validation_test
Class: OMBValidationTest
Method: test_max_connections

test_id:    OMBValidationTest.test_max_connections
status:     FAIL
run time:   99.773 seconds

ValueError("'n2-standard-16' is not a valid MachineTypeName")
Traceback (most recent call last):
  File "/opt/.ducktape-venv/lib/python3.10/site-packages/ducktape/tests/runner_client.py", line 177, in _do_run
    self.test = self.test_context.cls(self.test_context)
  File "/home/ubuntu/redpanda/tests/rptest/redpanda_cloud_tests/omb_validation_test.py", line 167, in __init__
    self.tier_machine_info = get_machine_info(
  File "/home/ubuntu/redpanda/tests/rptest/services/machinetype.py", line 87, in get_machine_info
    return MachineTypeConfigs[MachineTypeName(machine_type)]
  File "/usr/lib/python3.10/enum.py", line 385, in __call__
    return cls.__new__(cls, value)
  File "/usr/lib/python3.10/enum.py", line 710, in __new__
    raise ve_exc
ValueError: 'n2-standard-16' is not a valid MachineTypeName

JIRA Link: CORE-3049

[travisdowns]

Fixed in #18578

[vbotbuildovich]

*https://buildkite.com/redpanda/vtools/builds/15653

[vbotbuildovich]

*https://buildkite.com/redpanda/vtools/builds/15724