Bug 1966172 [wpt PR 52499] - [soft navs] Add smoke test for almost soft navigations.,

Automatic update from web-platform-tests
[soft navs] Add smoke test for almost soft navigations.

These are situations that come very close to a soft navigation,
but fail satisfying one of the criteria - e.g., that the
DOM nodes created must be attached to the DOM. The test
ensures that in these cases, we don't detect a soft nav.

Bug: 416748595
Change-Id: I1a81bf06bb04b1829f8d6c37753d97bb89e308d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6532369
Commit-Queue: Johannes Henkel <johanneschromium.org>
Reviewed-by: Michal Mocny <mmocnychromium.org>
Reviewed-by: Scott Haseley <shaseleychromium.org>
Cr-Commit-Position: refs/heads/main{#1459511}

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wpt-commits: 5c990c46cc35e10c2c7d379d6395c108c238c6c3
wpt-pr: 52499

Differential Revision: https://phabricator.services.mozilla.com/D250148

UltraBlame original commit: e891e2bcabae0f37421ae384600ec10ed338dc39

Author: marco-c