i15-1: Create system tests

We should be able to create a set of system tests that:
* Start up all the services we need (see https://github.com/DiamondLightSource/blueapi/blob/ab2ebc635684fc107bf2992339015ed1f18d1bb1/tests/system_tests/test_blueapi_system.py#L61)
* Run BlueAPI pointing at i15-1 with mock = True (https://github.com/DiamondLightSource/blueapi/blob/ab2ebc635684fc107bf2992339015ed1f18d1bb1/helm/blueapi/values.schema.json#L516)
* Run the plan
* Confirm data is written? Confirm analysis is triggered?

## Acceptance Criteria
- We can run our static collection plan is in a system test and confirm it does some useful things
- We add a doc in the BlueAPI repo aimed at other villages to explain how to do this with their plans

Start with the linked BlueAPI system test at tests/system_tests/test_blueapi_system.py and the mock setting in helm/blueapi/values.schema.json, then inspect this repository for the static collection plan and existing test entry points. Done means a system test starts the required services, runs the plan against i15-1 with mock=True, verifies useful data or analysis behavior, and adds the requested BlueAPI guidance for other villages.

Written by the indexing model from the issue text.