Add an IntegrationTestSuite for the QGB IT

[rach-id]

Similar to #419, it would be better for the QGB to define an IntegrationTestSuite as it will allow removing a good number of repetitive lines of code, and it is more elegant.

[rach-id]

Follow up:

With integration test suite:
Pros: remove 6 duplicate lines from each test and put them during integration test initialization.
Cons: not able to run the tests separately (they only run all of them).

Without integration test suite:
Pros: being able to run the tests separately and debug them separately
Cons: 6 additional initialization lines per test.

Does the ability to run tests separately (same as unit tests) worth an additional 6 lines per test ?

[rach-id]

Current decision, stick with the current implementation without adding an integration test suite as the ability to run tests individually is really helpful at the moment