[EKS] [request]: Support > 100 managed node groups

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**Tell us about your request**
Increase the current hard limit of 100 EKS managed node groups.

**Which service(s) is this request for?**
EKS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
We use managed node groups to isolate different types of workloads onto their own nodes to limit the noisy neighbour effect. When using persistent volumes, it is recommended to have separate node groups per availability zone. Furthermore, during upgrades we prefer to create replacement node groups instead of upgrading the existing ones (blue green deployment). The reason we chose b/g upgrades for certain node groups is that some of our applications don't play well with draining of nodes.

This leads to the following calculation:

Number of workload types * Number of availability zones * 2 (for upgrades) = Number of needed node groups

Therefore it's not unrealistic for us to hit the 100 node group limit at some point.

**Are you currently working around this issue?**
We currently simply need to limit ourselves in terms of how many custom node groups we can have and/or need to create additional clusters and split workloads across clusters.

The issue concerns AWS EKS managed node groups and names no repository file, test, or entry point. Start by reviewing the EKS service limit and the stated workload, availability-zone, and blue-green upgrade calculation; done means the 100-group constraint has a supported resolution.

Written by the indexing model from the issue text.