Unhide --isolated global argument

[silvanocerza]

Summary

This PR makes the --isolated global argument visible, previously it was hidden.
Fixes #4981.

Test Plan

I ran cargo run -- help to verify --isolated was visible and it is.
I ran clippy with cargo clippy --workspace --all-targets --all-features --locked -- -D warnings as CI does.

I also ran tests locally with:

cargo nextest run \
            --features python-patch \
            --workspace \
            --status-level skip --failure-output immediate-final --no-fail-fast -j 12 --final-status-level slow

[zanieb]

Thanks!