Add CLI e2e tests

[johnbelamaric]

This adds the CLI E2E tests. A couple notes:

• Like the other e2e tests, in order to run you need to create a cluster and deploy porch, and set E2E=1
• These require that porchctl is built and in the path.
• Currently they also require that kpt is built and in the path, because a few tests execute kpt fn. There is no need to have a version of kpt with kpt alpha commands, just kpt fn.

I manually ran the e2e tests in this PR.

[nephio-prow]

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