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Pre-fetch RESTBase DNS and negotiate TLS

Description

Pre-fetch RESTBase DNS and negotiate TLS

Keep VisualEditor load times snappy by eagerly establishing a connection with
RESTBase via a beacon request, which is deferred until after window.onload /
setTimeout to ensure it does not slow down the loading of the page.

Task: T94784
Change-Id: I19fd2ef6beffe1c4c4f05c2716da079b49e88b95