Integration tests and local test server for bandwidth metrics

[CFKevinRef]

This reverts commit 3ee9488 with the in-progress integration test server. Original PR text follows.

For testing I used a Local Server, which is documented here. The purpose of this server is to control different network conditions so that we can test that the events are created successfully. I had to modify Integration Test Host capabilities to allow incoming and outgoing connections for App Sandbox to run tests in Mac Catalyst (and possibly real devices too)

I also added some random fixes in the Integration Tests suite to try to fix some issues that were causing random fails and reorganized some functions to reuse across tests. Main function being waitForPlaybackToStart, which we should add to most existing tests.

Added a new test plan, LocalServerTests, to run specifically the new suite of tests that requires the new local server. That test plan holds two environment variables TEST_HOST and TEST_PORT, defaulted to localhost:8080, but open to modification. The other test plans exclude this new test suite, however this is apparently ignored by SauceLabs, and also Sauce Labs doesn´t allow env variables in real devices, hence why I added RUN_SERVER_TESTS_FLAG

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