Replace docker-compose breeze setup with testcontainers

[potiuk]

Part of breeze is a whole set of docker-compose files that are used to setup environment where various databases and integrations are set-up. This feature uses composability (sic!) of docker compose files and allows us to start breeze with the right set of database, integrations as docker-compose containers running together.

However there is a new tool called testcontainers https://testcontainers.com/?language=python that seem to have similar aim, but rather than using declarative and composable docker compose yaml files, they utiise native programming language integration to launch and shut-down necessary containers during running tests.

We could employ it to replace what breeze currently does for that part of our dev environment, and the added benefit is that you would not have to use breeze if you would like to run tests with "postgres", "kafka" etc. You would be able to do it easily using regular unit tests.

The part of breeze where it installs and manage the common container with all dependencies would still remain, but we could - I think fairly easily simplify and replace the part of Breeze where necessary containers are started via --backend and --integration database and plug them in pytest fixtures that could start/teardown necessary containers as needed even outside of breeze.