Update hexaPolicy.rego to use policy.meta.policyId instead of policy.id

[independentid]

Policy-OPA is using an out-of-date version of hexa Policy and referencing Policy.Id which does not exist in present IDQL.

Note that this impacts actionRights and allowSet functions which return lists of policy Ids that are enabled.

OPA Provider in policy-mapper will need to be updated to assign a default PolicyId value.