Switch to Dumps wikitext_raw_rc2 schema.
In this MR we pickup the changes from repos/data-engineering/dumps/mediawiki-content-dump!18 (merged).
Additionally, we:
- Consolidate page content change and visibility change stream consumption into one DAG, and make sure we consume page content events before visibility events. This helps for partial correctness. There are still unlikely but possible correctness issues being discussed elsewhere.
- Start writing to a new version of wikitext_raw :
wikitext_raw_rc2
.
Bug: T340863