Issue #3462264 by alexpott: Skip unsupported methods in rest/jsonapi tests in an efficient way

...xonomy/tests/src/Functional/Rest/TermXmlBasicAuthTest.php

.../taxonomy/tests/src/Functional/Rest/TermXmlCookieTest.php

...s/user/tests/src/Functional/Rest/UserResourceTestBase.php

...odules/user/tests/src/Functional/Rest/UserXmlAnonTest.php

...s/user/tests/src/Functional/Rest/UserXmlBasicAuthTest.php

...ules/user/tests/src/Functional/Rest/UserXmlCookieTest.php

...spaces/tests/src/Functional/Rest/WorkspaceXmlAnonTest.php

...s/tests/src/Functional/Rest/WorkspaceXmlBasicAuthTest.php

...aces/tests/src/Functional/Rest/WorkspaceXmlCookieTest.php