Fix cross-drive script installation (#11167)
Fallback to copy if renaming a script doesn't work, similar to the site
packages installation.
Fixes #11163
**Test Plan**
Failing:
```
docker volume rm -f gh11163_usr_local_bin
docker run -v gh11163_usr_local_bin:/usr/local/bin -e UV_LINK_MODE=copy -v $(pwd):/io -it --rm ghcr.io/astral-sh/uv:0.5-python3.11-bookworm-slim uv pip install --system ruff
```
Passing:
```
cargo build --target x86_64-unknown-linux-musl
docker volume rm -f gh11163_usr_local_bin
docker run -v gh11163_usr_local_bin:/usr/local/bin -e UV_LINK_MODE=copy -v $(pwd):/io -it --rm ghcr.io/astral-sh/uv:0.5-python3.11-bookworm-slim /io/target/x86_64-unknown-linux-musl/debug/uv pip install --system ruff
```
