rptest: request feature state from each node in await_feature #23579
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Fixes ControllerSnapshotPolicyTest.test_snapshotting_policy test.
Before the test would spuriously fail because it would try to deactivate and then reactive the feature before waiting for deactivation to finish.
The admin endpoint checks feature state without a linearizable barrier to short-circuit execution if feature is already active. This is why we need to wait for previous command to be applied first. To make sure the in-memory state is updated.
Regression likely introduced in #22533
Backports Required
Release Notes