Add missing rustc binaries to rustc_lib filegroup (#3727)
## Summary
Add `rust-objcopy` and `wasm-component-ld` to the `rustc_lib` filegroup
in `repository_utils.bzl`. These binaries are present in recent rustc
distributions (wasm-component-ld since 1.82.0, rust-objcopy since
1.84.0) but were not previously declared.
### Changes
- **Binary Declaration**: Add `rust-objcopy{binary_ext}` and
`wasm-component-ld{binary_ext}` to the rustc_lib filegroup glob patterns
### Context
On Windows, Bazel copies files into the sandbox rather than symlinking,
so only explicitly listed files are available. This caused wasm32-wasip2
builds to fail with `linker 'wasm-component-ld.exe' not found`.
On Linux/macOS, the issue was masked by symlink-based sandboxing which
allowed rustc to access unlisted files in the same directory.
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Co-authored-by: UebelAndre <github@uebelandre.com>
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