fix(package): Register workspace member renames in overlay

This was reported at #10948 (comment)

I suspect there is a second bug here because my debugging only showed us
doing this for `val-json` and not `concepts` and only when building `utils`.

For the exact mapping between the publish payload and the index,
see
https://doc.rust-lang.org/cargo/reference/registry-index.html#json-schema,
particularly the note about differences.

Author: epage

src/cargo/ops/cargo_package/mod.rs

@@ -1033,8 +1033,15 @@ impl<'a> TmpRegistry<'a> {
             .deps
             .into_iter()
             .map(|dep| {
-                let name = dep.name.into();
-                let package = None;
+                let name = dep
+                    .explicit_name_in_toml
+                    .clone()
+                    .unwrap_or_else(|| dep.name.clone())
+                    .into();
+                let package = dep
+                    .explicit_name_in_toml
+                    .as_ref()
+                    .map(|_| dep.name.clone().into());
                 RegistryDependency {
                     name: name,
                     req: dep.version_req.into(),