Provide a flag to disable spinner during uv pip sync/install

[samj1912]

uv currently renders a spinner that might make it difficult to render logs in browser/web components easily as it can spew a lot of output. It would be great if uv could expose a flag similar to pip to disable the progress bar/spinner.

[charliermarsh]

Yeah we should support --no-progress or something.

[zanieb]

I felt like we had a discussion about this when adding the progress bars but can't find anything.

[silvanocerza]

A global --no-progress-bar option is a good idea I think.

I can take care of this, though I don't know all the commands that print progress bars.

[charliermarsh]

IIRC we decided that we wanted to add it, but punted on it at the time :)