add ip target tests for gateway api

[zac-nixon]

Description

refactors the gateway api e2e tests to execute faster. once #4225 is fully working, these tests will execute without any manual intervention.

e2e tests uncovered a bug in the TG creation logic.

ran e2e tests locally -

Ran 4 of 4 Specs in 1391.627 seconds
SUCCESS! -- 4 Passed | 0 Failed | 0 Pending | 0 Skipped
PASS

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zac-nixon

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• OWNERS [zac-nixon]

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[shraddhabang]

/lgtm
/approved