fix: pnpm alias workspace deps (#5569)
### Description
Fixes #5441
Adds support for [referencing workspaces through
aliases](https://pnpm.io/workspaces#referencing-workspace-packages-through-aliases)
by properly resolving them to the correct workspace. Before we would
mark a package as being an external dependency (or if the alias was a
valid workspace depend on the incorrect one).
This PR now recognizes when `workspace:` dependency references a
different package than the name that's used in the `package.json`.
Note for reviewers:
This probably isn't the cleanest solution in either Rust or Go, but
while we need to maintain two codepaths this keeps the code roughly
equivalent.
### Testing Instructions
Added unit tests on the Go side.
Tested manually with a repository where `web` specified it's dependency
on `@scope/ui` as `"ui": "workspace:@scope/ui@*" and verified that:
- `turbo run build`: `@scope/ui` finished building before building
`web`, this hits the Go impl
- `turbo prune --scope=web`: `@scope/ui` was included in the pruned
repository, this hits the Rust impl
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Co-authored-by: Chris Olszewski <Chris Olszewski>
