Rename metrics and regroup metrics inside metrics folder
- Refactored code in SQL queries, calculation notebook, and wikicharts to output and use new metric variable names.
- Removed underscores in variable names
- Used proper region names in regional unique devices.
- Corrected gender labels in content_gaps.tsv and relevant code to use 'men', 'women', and 'gender-diverse'.
- Regrouped metrics into Content interactions, Unique devices, Editing, Content, Content gaps.
- Added user pageviews into content_interactions.tsv.
Bug: T362207