Check all ancestor navigable trustworthiness for mixed content (#36157)

Propagate through documents a flag that represents if any of the
ancestor navigables has a potentially trustworthy origin.

The "potentially trustworthy origin" concept appears to have gotten
confused in a couple of places and we were instead testing if a URL had
"potentially trustworthy" properties.

The main test for the ancestor navigables is
[mixed-content/nested-iframes](https://github.com/web-platform-tests/wpt/blob/master/mixed-content/nested-iframes.window.js)

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Signed-off-by: Sebastian C <sebsebmc@gmail.com>

components/script/links.rs

@@ -440,6 +440,7 @@ pub(crate) fn follow_hyperlink(
             referrer_policy,
             Some(secure),
             Some(document.insecure_requests_policy()),
+            document.has_trustworthy_ancestor_origin(),
         );
         let target = Trusted::new(target_window);
         let task = task!(navigate_follow_hyperlink: move || {