chore: Enable `share-generics` (#50673)
### What?
Reduce the binary size by enabling `-Zshare-generics`.
### Why?
The binary size is way too big.
### How?
`153.6MiB` => `132.9MiB`
(Apple silicon)
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Closes WEB-1144
Turbopack counterpart: https://github.com/vercel/turbo/pull/5121
