Document how to test with larger websocket frames

[dimaqq]

Description

https://matrix.to/#/!xdClnUGkurzjxqiQcN:ubuntu.com/$49wTojb4U3svWiepHWj0L6M2BgpD57TGZQDZPzOSQVY?via=ubuntu.com&via=matrix.org&via=matrix.hya.sk

Huh, interesting problem. It looks like python-libjuju itself allows you to easily override the default of 4MB. However, pytest-operator doesn't expose this setting. It looks like your best bet for a workaround would be to monkey-patch plugin.OpsTest._connect_to_model so you can change the model.connect call.

Urgency

It would save from a weird workaround

Code I'd Like to Run

deploy + wait_for_idle for large bundles or models