resourceloader: Deprecate OutputPage::addModuleScripts()

And the counter-part in ParserOutput as well.

This follows-up on 80e5b160e0985, which removed the last use of this
method. It also deprecated ResourceLoaderClientHtml::setModuleScripts()
but that isn't usually used directly. The public interfaces are
mainly in OutputPage/ParserOutput, which are now deprecated as well.

Bug: T188689
Change-Id: I90baafdfc089ac03c4c3abc12065c0b60d43994e