Remove some vars from make push-e2e target

[rramkumar1]

We now pass these vars through inside of the e2e job config so they are no longer needed in the Makefile.

/assign @bowei

[k8s-ci-robot]

Hi @rramkumar1. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[nicksardo]

/lgtm