Upgrades for karpenter v0.19.1

[askulkarni2]

Things that need upgrade:

1. Helm chart version upgrade
2. Native Spot Termination Handling IRSA policy update (#2546)
3. Update values.yaml for karpenter-global-settings

[armujahid]

Perhaps we also need to maintain backward compatibility so that karpenter < v0.19.0 can also be installed.

[FernandoMiguel]

Perhaps we also need to maintain backward compatibility so that karpenter < v0.19 can also be installed.

what do you propose @armujahid ?

[armujahid]

@FernandoMiguel we can somehow add a conditional check while setting helm values (and IAM policies?) similar to
https://github.com/weaveworks/eksctl/pull/5934/files#diff-4dcf687b868f9aa422944c40d074a7948519882a86e66375305ee74963b821a7R87

So that new logic will only run for karpenter >= 0.19.0 and flow remain unchanged for older versions

[FernandoMiguel]

@armujahid but we dont have go here... only terraform
not sure how the maintainers of this project would want to handle this

[FernandoMiguel]

we can keep HEAD using latest karpenter, and anyone that needs the older config can use a previous release tag

[armujahid]

@FernandoMiguel yeah that's logical. we can document this somewhere and/or restrict user to select karpenter version less than 0.19.0

[FernandoMiguel]

@armujahid i wouldnt know how that is best handled on this project since I dont handle release notes

[bryantbiggs]

users are able to provide both the version of Karpenter as well as its associated values so we don't need to worry about anything dynamic