revlog: simplify rawtext return value
We're always returning a tuple even though only the raw text is being used,
and we're rebuilding another tuple again higher.
As a bonus, this will remove one tuple creation and deletion
per `raw_text` call, hence fewer gc calls, etc.
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2