Should we add gatewayapi/helpers.go to coverpkg?

Do we want to add gatewayapi/helpers.go to -coverpkg=./... so that it doesn't matter which package the tests belong to when counting coverage?

xref: https://github.com/envoyproxy/gateway/pull/196#issuecomment-1211092656

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@LukeShu can you help understand if this is needed ?