merge_pr_48594

part 6) Add javascript-url navigation via form-submission tests for Trusted Types.

Differential Revision: https://phabricator.services.mozilla.com/D223596

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1921008
gecko-commit: 999a70cf9b2dcc6fc81fc8fbe9f7a811f6056db5
gecko-reviewers: tschuster