[Gecko Bug 1959610] Align CloseOuter with #script-closable session history check. #52115
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Since whatwg/html#6315, script-closable checks for a
history length of one, instead of the session history containing only one
document.
This commit also adds a wpt to test that windows opened by links and forms
count as
created by a script.Differential Revision: https://phabricator.services.mozilla.com/D245035
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1959610
gecko-commit: e0390012bdc423f35439ff7c3709ba26982b8883
gecko-reviewers: smaug