wifi: iwlwifi: tests: check transport configs are not duplicated

Add a kunit test to check that all (used) transport config structs
are not duplicated, since there's no value in having the same info
in two places in memory.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250502155404.a151af19aaba.Id57f099a899e09318c6218ed1859151f00232b41@changeid