Add unit tests for the ECS reporter

[2opremio]

Leftover from #2026

[2opremio]

Fixing this should include addressing the following TODO:

		// TODO: add ECS nodes in report fixture
		if topology.Name == "Tasks" {
			continue
		}

scope/app/api_topologies_test.go

Lines 47 to 50 in 9c72822

	// TODO: add ECS nodes in report fixture
	if topology.Name == "Tasks" {
	continue
	}

[ekimekim]

fixed by #2065