fix(bun): deserialize correctly and use optionalPeers (#10219)
### Description
Resolves https://github.com/vercel/turborepo/issues/9058 and
https://github.com/vercel/turborepo/discussions/7456 (again)
When I tested my previous PR (#10175) on another repo, I discovered an
issue with a missing dep in the pruned lockfile
To reproduce this in the `with-yarn` example repo:
`cd apps/web && bun install dd-trace`
and
`cd apps/docs && bun install @opentelemtry/api`
Then run prune for `web` and try `bun install --frozen-lockfile` and
you'll get this:
```
error: Failed to resolve peer dependency '@opentelemetry/api' for package '@opentelemetry/core'
at bun.lock:1:16974
InvalidPackageInfo: failed to parse lockfile: 'bun.lock'
```
### Issue 1 -- Deserialization casing
The underlying error is rather straightforward -- it was deserializing
most dependencies (`peerDependencies`, `devDependencies`,
`optionalDependencies`) to `other` 😄
This is because it just needed `#[serde(rename_all = "camelCase")]`
since the rust names are snake case. This is why `dependencies` happened
to work -- it's the same in snake and camel case.
By virtue of being in `other`, all non-`dependencies` packages were
effectively ignored during the pruning process, and don't always end up
in the resulting lockfile.
### Issue 2 -- optionalPeers
After fixing that, I also stumbled upon another issue:
```
WARNING Unable to calculate transitive closures: No lockfile entry found for 'next/@playwright/test'
```
This is because we weren't accounting for the `optionalPeers` property.
`next` doesn't actually require you have `@playwright/test`, it's an
optional peer. I fixed this as well.
