Implement Public Hub integration tests as separate job

[pkosiec]

Description

• Prepare test setup

  • Neo4j + Hub JS + populator + run Go tests
  • We can use Docker compose

• Prepare list of tests for edge cases we want to test

• Modify GitHub Actions pipeline and run these tests in parallel to our full E2E integration tests

Base on #658

Reason

Currently, we have a very basic happy path tests for our Public and Local Hub:
https://github.com/capactio/capact/blob/955dd17c33e37db881257194d77c6fb4751b5e50/test/e2e/hub_test.go

Unfortunately they don't test many edge cases (e.g. for Local Hub, deleting locked TypeInstance with the same ownerID). If we want to add more test cases, it would be very slow. That's why we need to split them to dedicated jobs, running without Kubernetes and with minimal set of Capact components, and then we can add another test cases.