(Follow up): Integrate Kapp: Add e2e tests for extension reconciler

[varshaprasad96]

Follow up of #625 that adds logic to create App CR from Extension reconciler:

• Modify existing test setup in the following locations to include Kapp-controller installation:
  • e2e test suite: https://github.com/operator-framework/operator-controller/blob/main/test/e2e/e2e_suite_test.go
  • Makefile:

    operator-controller/Makefile

    Line 144 in d51d908

    test-e2e: run image-registry build-push-e2e-catalog kind-load-test-artifacts e2e e2e-coverage undeploy kind-clean #HELP Run e2e test suite on local kind cluster

• Enable feature gate to allow running of Extension reconciler (already present): https://github.com/operator-framework/operator-controller/blob/main/internal/controllers/extension_controller_test.go
• Add e2e tests (similar to what is present in cluster extension), ensuring that extension controller behaves as required.