Add configmap mounting for RBAC teams ENG-3182

[Sean-Holcomb]

What does this PR change?

This PR adds the ability to mount a configmap via helm values to be used as a configuration for RBAC teams

Does this PR rely on any other PRs?

#3799
https://github.com/kubecost/kubecost-cost-model/pull/2875/files#diff-c2c67151419742af1f2e7c1e6e71238cda0f5bbb0a0a54147efa2fdd8ed8744a

How does this PR impact users? (This is the kind of thing that goes in release notes!)

Links to Issues or tickets this PR addresses or fixes

What risks are associated with merging this PR? What is required to fully test this PR?

How was this PR tested?

This PR was tested using helm template with the following values

rbac:
    teamsConfig:
      - id: test-id
        name: test-name
        roles:
          - id: test
        claims:
          key: value
          key2: value2

Key results in the template

env:
 ...
            - name: RBAC_TEAMS_HELM_CONFIG_PATH
              value: "/var/configs/rbac-teams-configs/rbac-teams-configs.json"

# Source: cost-analyzer/templates/kubecost-rbac-teams-configmap-template.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: "kubecost-rbac-teams-config"
  namespace: default
  labels:
    app.kubernetes.io/name: cost-analyzer
    helm.sh/chart: cost-analyzer-2.3.3
    app.kubernetes.io/instance: release-name
    app.kubernetes.io/managed-by: Helm
    app: cost-analyzer
data:
  rbac-teams-configs.json: '[{"claims":{"key":"value","key2":"value2"},"id":"test-id","name":"test-name","roles":[{"id":"test"}]}]'
---

volumes:
  ...
        - name: kubecost-rbac-teams-config
          configMap:
            name: kubecost-rbac-teams-config

 volumeMounts:
            ...
            - name: kubecost-rbac-teams-config
              mountPath: /var/configs/rbac-teams-configs

Have you made an update to documentation? If so, please provide the corresponding PR.

[kaelanspatel]

LGTM