ff3bcbb639
## Summary This PR gets rid of the global `--isolated` flag (which serves a bunch of independent responsibilities right now) on `uv tool run` in favor of a dedicated `--isolated` flag, which tells uv to avoid re-using an existing tool environment for this invocation. We'll add the same thing to `uv run`, to avoid using the base project environment. This will become a bit clearer in #5466, when we deprecate the `--isolated` flag on the preview APIs.