Update supported k8s version wording

General MR

Summary

Updates wording to clarify BB's position on k8s version. Also updates to reference testing on 1.24 (release testing is on RKE2 1.24.4).

Preview of doc: https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/k8s-version-docs/docs/prerequisites/kubernetes-preconfiguration.md#kubernetes-version

docs/prerequisites/kubernetes-preconfiguration.md

@@ -46,7 +46,9 @@ You can override bigbang's helm values so istio will provision a service of type
 
 ### Kubernetes Version
 
-* We currently support up to k8s version 1.23, and back to Kubernetes releases that are not end of life https://kubernetes.io/releases/
+* While Big Bang does not require/mandate usage of a specific Kubernetes Version, we also do not do extensive testing on every version
+* Currently Big Bang tests on 1.23 and 1.24 clusters, with primary testing for each release on 1.24
+* The team provides support for any issues encountered due to Kubernetes version for any releases that are [supported/not end of life](https://kubernetes.io/releases/)
 
 ### VMWare Tanzu Kubernetes Grid