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GH actions: Improve caching

- Removes caching used in eks-ci. Since that action runs only on the main branch, it doesn't affect developers as much as using our cache for PRs.
- Re-add restore-keys for hermit environment. This was deleted because of https://github.com/elastic/cloudbeat/issues/2446. However, we are cleaning the local hermit cache on cache misses, which should avoid constantly increasing our cache size.
- Re-use our hermit setup action in eks-ci, remove old go caching