Run e2e tests on PRs raised from forks

[jimassa]

Is your feature request related to a problem? Please describe.

Currently, we are unable to run our e2e tests in pr open from forks because github does not allow sharing secrets to forks for security reasons. For this reason, we only run e2e when pr is added to merge queue. Our current implementation uses AKS for our e2e, but it can be implemented in any Kubernetes cluster.

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