feat: (PSKD-814) Default K8s version is 1.30, add support for 1.31

[dhoucgitter]

Changes:

• Updated default Kubernetes version to 1.30 and added support for Kubernetes 1.31.
• Updated kubectl version to 1.30.x
• Updated the Dockerfile to download kubectl from a new location with checksum verification.

Tests:

See comment below for test details.

[dhoucgitter]

Scenario	K8s version	Postgres DB	PG Database	Notes
1	Provision a K8s 1.29 EKS cluster	no external Postgres	none	successful cluster creation
2	Provision a K8s 1.30 EKS cluster	external Postgres	none	successful cluster creation
3	Provision a K8s 1.31 EKS cluster	external Postgres	none	successful cluster creation
4	Provision a K8s 1.30 EKS cluster	external Postgres	create "SharedServices" database	successful cluster creation, successful deploy of Viya 4 stable 2024.11 order
5	Provision a K8s 1.31 EKS cluster	external Postgres	create "SharedServices" database	successful cluster creation, successful deploy of Viya 4 stable 2024.11 order using Deployment Operator and kubectl version 1.31.2 override

[dhoucgitter]

In answer to a review question, the almalinux:minimal work layer was added to the Dockerfile to gain access to a shell supporting process substitution which is being used to validate the kubectl download checksum. None of the existing layers had a shell that supported the required process substitution expression. The work layer is only used for the download and checksum verification. The kubectl binary is copied out of that layer for the final image so no increase in image size overall.

[saschjmil]

LGTM. Thanks for explaining the added work layer