Don't run integration tests in release jobs

[Youssef1313]

Integration tests mostly just start child processes, does dotnet build (many tests already tests Debug and Release), and starts the test app to assert some expected output/behavior.

We run those integration tests both under Debug/Release jobs which is redundant. Note that the redundant part I'm referring to is about that the integration test project itself is built via Debug/Release. This is not about the test apps being tested.

We should also then avoid building integration test projects under Debug jobs altogether.