Removing pypi check_for_updates from commands where it halts offline execution

[jason-weirather]

Checking the version of comfy-cli in commands where internet-access is not necessary, such as comfy launch and comfy env causes comfy-cli to hang in a docker container (or offline) environment.

I opened an issue to describe this
#175

This PR removes just those calls to check_for_updates() that ping pypi each time a comfy launch is run or a comfy env is checked where offline operation can otherwise work perfectly.

[robinjhuang]

Can we change the check_for_update function to fail gracefully instead?

[jason-weirather]

Can we change the check_for_update function to fail gracefully instead?

I think thats a reasonable solution if its very fast to fail gracefully. Otherwise we will have every command hanging for seconds while it waits trying to have a conversation with the pypi servers, and that would reduce performance in some deployments.

[jason-weirather]

I've submitted a new PR following @robinjhuang suggestion to add a timeout and fail quietly.

#183