Intent to Unship: beforescriptexecute and afterscriptexecute events in early Beta

As of Firefox 140, I intent to stop dispatching beforescriptexecute and afterscriptexecute events to web content in early Beta. These event are non-standard and isn't implemented by other browsers.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1964343

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