Replace native "document.write" with deprecated fallback

Replace native "document.write" with deprecated fallback

In most browsers, calling "document.write" after the document is
ready results in the document being re-created with the specified
content (effectively replacing with blank page).

While this is a browser issue, mitigate this by replacing the
method with a fallback (wrapped in "mw.log.deprecate") that just
appends the given HTML to the document body.

Note that scripts do not execute when appended as HTML, they will
become dormant elements. It'll work for raw content as a basic
fallback, but it should become apparent to the end user that the
code needs to be upgraded.

Bug: T108139
Change-Id: Ic9056d7a779f234a28ddad005fd4d76f2e750fcc