WIP: remove realtime for debug purposes

[taratatach]

We want to test the new ProxyAgent without the Realtime to make sure it works on its own.Please make sure the following boxes are checked:

• [ ] PR is not too big
• [ ] it improves UX & DX in some way
• [ ] it includes unit tests matching the implementation changes
• [ ] it includes scenarios matching a new behaviour or has been manually tested
• [ ] it includes relevant documentation

[taratatach]

Closing in favor of https://github.com/cozy-labs/cozy-desktop/pull/2319