docs: fix pr doc builds by removing external_version_warning plugin #3244
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rickeylev force-pushed the docs.fix.pr.builds branch from cbba66a to 80979bf Compare rickeylev changed the title 
| Turns out the doc build errors in PRs were an actual bug, not a flake. Found and fixed. |
aignas approved these changes Sep 7, 2025
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Doc builds for PR were failing because the readthedocs_ext.external_version_warning
plugin wasn't handling something correctly. Activating it manually was originally
done to get the warning banners to appear, but it looks like RTD now displays a
warning banner without this special plugin being needed.
Since it's now unnecessary, remove the code that can activate it.