tests: fix relayer/consensus discrepancy for throttle v2 e2e test

[shaspitz]

Description

Handles a discrepancy with how packets are relayed between gorelayer and hermes in e2e tests for throttling v2.

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[shaspitz]

Now passes both go run ./tests/e2e/... --tc slash-throttle and go run ./tests/e2e/... --tc slash-throttle --use-cometmock --use-gorelayer 👍

[shaspitz]

Closing in favor of being happy with just the comet flavor of the throttling e2e test. Discrepancy tracked in #1304