Only require a GatewayClass if the gateway suite is being run

[adleong]

/kind test
/area conformance

What this PR does / why we need it:

When the conformance tests run, they require that a GatewayClass exists and that it has been accepted. However, this is not appropriate when testing mesh only conformance because mesh implementations do not necessarily have a GatewayClass. This change moves the GatewayClass requirement into the Gateway suite so that this is only checked when the Gateway feature is enabled.

Does this PR introduce a user-facing change?:

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: adleong / name: Alex Leong (014c4b1, e990374)

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[arkodg]

LGTM thanks !

[robscott]

Thanks @adleong!

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adleong, arkodg, robscott

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• conformance/OWNERS [robscott]

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[robscott]

/ok-to-test

[robscott]

@adleong It looks like golangci-lint is failing:

conformance/utils/suite/suite.go:153: File is not `gofumpt`-ed (gofumpt)
		
�[0;31mTest FAILED: hack/../hack/verify-golint.sh 

Whenever you get time to fix that we should be good to merge this.

[robscott]

@adleong Do you have time to take a look at the linting issue here? Would love to get this one in before v0.8.0 if you've got time for it.

[adleong]

Yes, sorry for the delay. I'll try to get this fixed up today.

[robscott]

Thanks @adleong!

/lgtm