Add test for other collections with (add/remove)(First/Last) methods. Add test for LinkedHashMap.put(First/Last) methods (they are also appeared in Java 21)
^KT-58765
Now that JDK 21 was released as stable, we can remove separate test
configurations for testing the compiler with JDK 21 and reintegrate
the corresponding test data into standard test configurations.
Mikhail Glukhikh