Nexus bigbang template: hardcoded values should be templated

The Nexus template does not not template the role values
https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/master/chart/templates/nexus-repository-manager/values.yaml#L50-57
BigBang values has

addons:
  nexus:
    sso:
      # -- NXRM Role
      role:
        id: ""
        name: ""
        description: ""

but the template has the values hardcoded and does not template the values.

sso:

  role:
    id: "keycloak"
    name: "keycloak"
    description: "all keycloak users as admins"
    privileges:
      - "nx-all"
    roles:
      - "nx-admin"

users must do a values override

addons:
  nexus:
    values:
      sso:
        # -- NXRM Role
        role:
          id: "Nexus"
          name: "Keycloak Nexus Group"
          description: "all keycloak users as admins"
          privileges:
            - "nx-all"
          roles:
            - "nx-admin"