Verify power state after rescue operations

Add expected_power_state parameter to _wait_for_power_state_stable() to ensure rescue operations actually power on instances. Previously, the method only checked if power state was stable, not if it matched the expected state. This caused false success reports when rescue failed to power on instances, leading to 120s timeouts in Ironic.

Now logs detailed diagnostics including fault info and full instance data when power state verification fails, enabling faster debugging.