consider disabling the Web Share API (Android and Windows)

From #33534 (closed): The Web Share API allows web pages to bring up a system sharing UI. Does this cause any disk leaks or proxy bypass possibilities? If it does, we should disable it.

https://bugzilla.mozilla.org/show_bug.cgi?id=1402369
"Implement Web Share API on Fenix"

https://bugzilla.mozilla.org/show_bug.cgi?id=1573029
"Implement Web Share on Windows"

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