feat: (PSKD-815) Default K8s version updated to 1.30, add support for 1.31

[riragh]

Changes:

• Updated default Kubernetes version to 1.30 and added support for 1.31.
• Updated the Dockerfile to download kubectl from a new location
• Added container-structure-test to verify kubectl version.

Tests:

Verified following scenarios, see internal ticket for details:

Scenario	Task	Provider	Cadence	kubernetes_version	Deploy method	Notes
1	OOTB	Azure	fast:2020	1.31	docker, DO: true	Manually overridden the kubectl version as Viya still does not support 1.31
2	OOTB, create_static_kubeconfig = false	Azure	fast:2020	1.30	docker, DO: false
3	OOTB	Azure	fast:2020	1.29	ansible, DO: true

[dhoucgitter]

LGTM