Add ruff, adjust pyugprade, autoflake in docs (Cherry-pick of #19555) #19576
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Fixes #19273 by adding ruff to the docs, both the auto-generated backend docs and the manual pages that list out backends. This doesn't try to solve the general problem of reminding us to add backends to docs.
While I was there, I noticed the pyupgrade and autoflake backends were referring to the
experimental
paths, but they've now graduated to non-experimental, so this switches them over.