Add make commands for e2e tests

[LogicalShark]

After this is submitted we can update test-infra to use the make commands, then remove the .sh files which have been changed to wrappers for the commands.

[k8s-ci-robot]

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[APPROVALNOTIFIER] This PR is APPROVED

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[LogicalShark]

/retest-required

[k8s-ci-robot]

@LogicalShark: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
cloud-provider-gcp-e2e-full	2bfa28a	link	true	/test cloud-provider-gcp-e2e-full

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.