Don't include images/categories when behind a local interwiki prefix

This solution is somewhat imperfect, as the logic being added here to
MediaWikiTitleCodec really belongs in the parser. However, given the
current state of this code, this is the cleanest possible solution at
the moment.

Modified the existing release note for this.

Bug: 68802
Change-Id: I38309186bdcad23f49e23beb26daaf3ef5bceea1
Merge "Don't include images/categories when behind a local interwiki prefix"