[FEATURE_REQUEST] Support HPA maxReplicas

[BlythMeister]

Description of the problem/feature request
Add check for HPA maxReplicas which functions in the same way as minReplicas

Additional context
We are migrating from datree and this was a check they have: https://hub.datree.io/built-in-rules/ensure-hpa-maximum-replicas

[janisz]

As @BlythMeister pointed we already have

kube-linter/pkg/templates/hpareplicas/template.go

Line 18 in 6ba361a

templateKey = "hpa-minimum-replicas"

template but it's limited to check minimum. Maybe we should add a new template that will check if replicas is in range and reuse it in min replicas to keep backward compatibility.

[BlythMeister]

As a use case, maximum is useful in a larger org to ensure someone doesn't go crazy on HPA and set like max 50 (don't ask me why...please don't ask me why!)

[janisz]

@BlythMeister - CEL expression solution using the new template:

• Add CEL template #1012

Simple Solution

customChecks:
  - name: hpa-max-replicas-limit
    template: cel-expression
    params:
      check: |
        object.kind == "HorizontalPodAutoscaler" && 
        object.spec.maxReplicas > 50 ?
        "HPA maxReplicas should not exceed 50" : ""