feat: (IAC-1344) (IAC-1363) Add support for K8s 1.29

[riragh]

Changes:

This PR updates the default versions of ingress-nginx, cluster-autoscaler and kubectl to add support for K8s 1.29

• Default ingress-nginx chart version is updated to 4.9.1
• Default cluster-autoscaler chart version is updated to 9.36.0
• Default kubectl version is updated to 1.28.7

Code to set default version of CLUSTER_AUTOSCALER_CHART_VERSION was simplified as K8s v1.24 is now out standard support for all the cloud providers. For users using K8s v1.24 to do LTS cadence version will now have to specify the CLUSTER_AUTOSCALER_CHART_VERSION in their ansible-var.yaml file. CONFIG_VARS.md file note is updated to guide user about the same.

Tests:

Verified following scenarios, see internal ticket for details.

Scenario	Task	Provider	Cadence	kubernetes_version	Deploy method	Notes
1	OOTB	Azure	fast:2020	1.27	docker, DO: false
2	OOTB	Azure	fast:2020	1.28	docker, DO: false	New default kubectl
3	OOTB	Azure	fast:2020	1.29	ansible, DO: true	Overwrite kubectl version in the DO
4	OOTB	AWS	fast:2020	1.29	ansible, DO: true	Overwrite kubectl version in the DO

[dhoucgitter]

LGTM