[Gecko Bug 1779231] [wdspec] Move argument and this argument callFunction tests to separate files.

[moz-wptsync-bot]

Depends on D156690

Differential Revision: https://phabricator.services.mozilla.com/D156811

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1779231 gecko-commit: db18156a55242726c93be3587821425644da8daa gecko-reviewers: webdriver-reviewers, jdescottes

[whimboo]

The failures with Chrome here exist because its BiDi implementation doesn't support script.getRealms yet.

@jgraham or @foolip could you admin merge please? Thanks!