User - Filter all the users who have SMTP credentials

The following example policy will filter and tag the users who have SMTP credentials

policies:
- name: filter-tag-user-with-smtp-credentials
  description: |
    Filter and tag users with smtp credentials
  resource: oci.user
  filters:
   - type: smtp-credentials
     key: smtp_credentials
     value_type: size
     op: greater-than
     value: 0
  actions:
   - type: update
     freeform_tags:
        TagName : TagValue