Remove global-rate-limit feature

[rikatz]

What this PR does / why we need it:

This PR removes the global-rate-limit feature. On the goal to make ingress-nginx more slim, we need to deprecate features not widely used.

Specifically this feature should be controlled by the fronting Load Balancer and not by ingress-nginx, and it adds some complexity on the code that we may not be able to maintain in future releases

/kind deprecation

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[rikatz]

/assign @strongjz @aojea

[rikatz]

please do not cherry-pick this change :)

[Gacko]

This was meant for testing different value types, not the global-rate-limit feature itself. Gonna re-add other values.

[saminou]

Any recommendation for people who use ingress-nginx as the fronting load balancer? :)

[longwuyuan]

I think the infra-provider created LoadBalancers support rate-limiting on most cloud providers.

[Gacko]

Sad fact: vSphere works with MetalLB, so there is no such Load Balancer fronting your cluster. The Load Balancer IP is a virtual IP of a node. Just one example...

[longwuyuan]

True. But also practical aspect is Metallb/On-premise type engineers will make sophisticated choices like rate-limit or DDOS protection etc on their edge router.