tests: Bluetooth: CAP: Acceptor bsim test use ext_adv

Remove a duplicated advertising set in the CAP acceptor babblesim
test. The advertising set is configured in test_start_adv.

The BSIM test for the CAP acceptor used legacy instead
of extended advertising.

This also adds the required advertising data and validation
on the CAP initiator and CAP commander.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>