install: skip workspace members whose package.json has no name - #38781

`skipped_with_dependencies` is a plain `Vec` with an unconditional `push`, so a nameless-with-deps directory matched by more than one `workspaces` entry (e.g. `["packages/fixture", "packages/*"]`) is recorded once per match and `warn_skipped()` prints the same warning N times. Named workspaces in the same situation dedup by path via `insert()`'s `get_or_put`. Purely cosmetic — checking `self.skipped_with_dependencies.iter().any(|d| &**d == relative_dir)` before the push would align them.