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Our CI workflows generally cache `**/node_modules` (note the glob, it caches all transitive node_module directories) to speed up startup for new jobs that don't change any dependencies. However it seems like one of our caches got into a weird state (not sure how it happened) where the `build` directory (used in various other scripts as the directory for compiled React packages) would contain a `node_modules` directory as well. This made sizebot size change messages very big since it would try to compare every single file in `build/node_modules`. The fix is to ensure we always clean the `build` directory before doing anything with it. We can also delete that one problematic cache but this PR is a little more resilient to other weird behavior with that directory.