Issue #, if available:

Description of changes:

• Add custom service client when perform e2e test
• Make sure AEMM is up before NTH
• Fix validation in prometheus-metrics-test

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

What's the reasoning behind moving AEMM before NTH helm upgrades? For other tests we always do NTH and then aemm. Wondering if the other tests should be updated as well

This pattern follows the approach in webhook-http-proxy-test, and webhook-secret-test.

I think we should be good for only updating these 3 tests (emit-events-test, prometheus-metrics-test, and webhook-test).

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