Set up a dev environment

Start the UI in a sort of "dev" mode where we can run simulated plans from a locally running blueapi instead of the beamline one

## Acceptance Criteria
- Specific criteria that will be used to judge if the issue is fixed

Start by locating the PyQt UI startup and blueapi connection configuration, then determine how a development mode can target a locally running blueapi rather than the beamline service. Done means the UI starts in that mode and can run simulated plans through the local blueapi; the issue currently provides no named files, tests, or specific acceptance criteria.

Written by the indexing model from the issue text.