Modernize the Wiktionary dump ingestion stage so it can consume both legacy and current MediaWiki export…

Modernize the Wiktionary dump ingestion stage so it can consume both legacy and current MediaWiki export…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). For each page, obtain the title, numeric namespace, revision, and wikitext by their XML meaning rather than by…