Cherry-pick "LibWeb: Let determine_the_origin() take an optional URL after all", second commit #25398
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I originally believed that this could never receive a null URL and the spec was inaccurate, but it seems like it can indeed.
I don't have a distilled test, but this makes logging in with GitHub work on https://v0.dev/
(cherry picked from commit 1a4b0ded1f802fdcc3ef9b919b5749b086471fc2; amended to also cherry-pick LadybirdBrowser/ladybird#2358)
LadybirdBrowser/ladybird#1537 (first commit was in #25345).