uv sync --no-build-isolation doesn't remove extra dependencies #6580
Description
Whenever uv sync is called with --no-build-isolation, any extra packages that shouldn't be there aren't automatically removed.
➜ uv --version
uv 0.3.3 (Homebrew 2024-08-23)
➜ uv add flask
Using Python 3.12.5
Creating virtualenv at: .venv
Resolved 9 packages in 2ms
Built bug @ file:///private/tmp/bug
Prepared 8 packages in 144ms
Installed 8 packages in 3ms
+ blinker==1.8.2
+ bug==0.1.0 (from file:///private/tmp/bug)
+ click==8.1.7
+ flask==3.0.3
+ itsdangerous==2.2.0
+ jinja2==3.1.4
+ markupsafe==2.1.5
+ werkzeug==3.0.4
➜ uv add --optional build setuptools
Resolved 10 packages in 69ms
Built bug @ file:///private/tmp/bug
Prepared 2 packages in 145ms
Uninstalled 1 package in 0.34ms
Installed 2 packages in 16ms
~ bug==0.1.0 (from file:///private/tmp/bug)
+ setuptools==73.0.1
➜ uv sync --no-build-isolation
Resolved 10 packages in 2ms
Audited 8 packages in 0.04ms
➜ uv sync
Resolved 10 packages in 0.50ms
Uninstalled 1 package in 26ms
- setuptools==73.0.1
➜ uv pip install ruff
Resolved 1 package in 2ms
Installed 1 package in 1ms
+ ruff==0.6.2
➜ uv sync --no-build-isolation
Resolved 10 packages in 0.66ms
Audited 8 packages in 0.05ms
➜ uv sync
Resolved 10 packages in 0.63ms
Uninstalled 1 package in 0.65ms
- ruff==0.6.2