dt/many_clients: Split out test_many_clients

[michael-redpanda]

Marked test_many_clients_pathological_compaction as ok_to_fail

Fixes: #10936

Backports Required

• none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v23.1.x
• v22.3.x
• v22.2.x

Release Notes

• None

[michael-redpanda]

Created #11386 to revert these changes

[michael-redpanda]

CI failures:

• CI Failure (Timeout - Failed to start) in MultiTopicAutomaticLeadershipBalancingTest.test_topic_aware_rebalance #11044
• CI Failure (timeout in kafka-topics.sh create topic) in RackAwarePlacementTest.test_replica_placement in DEBUG builds #11276

[michael-redpanda]

The start rpk smoke test failed... kicking back off that build

[michael-redpanda]

CI issues on rerun:

• CI Failure (ducktape.errors.TimeoutError) in throughput_limits_snc_test.ThroughputLimitsSnc.test_consumers #11157 (rerun initiated before fix applied)
• ValueError: min() arg is an empty sequence in CreateTopicUpgradeTest.test_retention_config_on_upgrade_from_v22_2_to_v22_3 #11182
• CI Failure (Timeout - Failed to start) in MultiTopicAutomaticLeadershipBalancingTest.test_topic_aware_rebalance #11044
• CI Failure (timeout in kafka-topics.sh create topic) in RackAwarePlacementTest.test_replica_placement in DEBUG builds #11276

[BenPope]

/backport v23.1.x

[BenPope]

Failure: https://buildkite.com/redpanda/redpanda/builds/34039#018995f2-4d09-403c-b13e-6a8985ce5fca

[vbotbuildovich]

Failed to run cherry-pick command. I executed the commands below:

git checkout -b backport-pr-11385-v23.1.x-130 remotes/upstream/v23.1.x
git cherry-pick -x ba3326ddbb26c06d169b7d4bb3f71d1783e2c4cb

Workflow run logs.