Undo traces of a practice we carried over from past projects and
existing examples that is neither universal nor actively encouraged in
the MediaWiki codebase.
Bug: T139301
Change-Id: I5c9c89b72a45a44aa4264a5e57b003c1a86cdf6e
Co-Authored-By: Brad Jorsch <bjorsch@wikimedia.org>
Add the data values and types to the exception raised when mismatched
session data is processed. This is done by passing the old and new
values on via a new MetadataMergeException class. The attached data is
added to the debug logging context info when caught.
Change-Id: If8a7174399289bc284ca1b36052ba515c8857c50