kafka: fix write caching validation during topic creation

[nvartolomei]

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
• v23.3.x
• v23.2.x

Release Notes

• none

[bharathv]

thanks for fixing.

[vbotbuildovich]

new failures in https://buildkite.com/redpanda/redpanda/builds/47611#018ec8a8-1fa5-49b2-8d82-1577c14d20bf:

"rptest.tests.cluster_bootstrap_test.ClusterBootstrapUpgrade.test_change_bootstrap_configs_after_upgrade.empty_seed_starts_cluster=True"

[nvartolomei]

• rptest.tests.cluster_bootstrap_test.ClusterBootstrapUpgrade.test_change_bootstrap_configs_after_upgrade.empty_seed_starts_cluster=True

It is an error from unrelated part of the code base which never calls any changed code. That code was merged recently #17624 so this is the first failure

Unrelated CI failure. Pinged enterprise team about it https://redpandadata.slack.com/archives/C04AVDG7N58/p1712768532905059