Intent to Unship: beforescriptexecute and afterscriptexecute events

[Edgar Chen]

As of Firefox 144, I intend to stop dispatching beforescriptexecute and afterscriptexecute events to web content by default on all channels. These events are non-standard and aren't implemented by other browsers.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1584269

Preference: dom.events.script_execute.enabled

web-platform-tests: https://wpt.fyi/results/html/semantics/scripting-1/the-script-element/historical.html

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Best regards,

Edgar Chen