[ci] Replace Rust caching with generic caching #2931
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Remove the
swatinem/rust-cache, which turns out to take over 8 minutes [1] in the post-cache step due to the size of the cached artifacts. It's mostly redundant with ourgenerate_cachejob, so this leads to a significant overall performance improvement.[1] https://github.com/google/zerocopy/actions/runs/21366905772/job/61501094657#step:38:1