[Frontend] Add group scope option to a policy drawer

Why are we doing this work

1. Policy scope will now have fourth option: scoping to a group
2. This issue adds new option to policy_scope dropdown
3. This option must be reflected on a policy drawer on policy list

Relevant links

Non-functional requirements

• Documentation:
• Feature flag: policy_group_scope
• Performance:
• Testing: unit tests

Implementation plan

1. Add new option in ee/app/assets/javascripts/security_orchestration/components/policy_drawer/scope_info_row.vue
2. Update grapqhql query to query groups as well ee/app/assets/javascripts/security_orchestration/graphql/fragments/policy_scope.fragment.graphql
3. Add tests
4. Make sure groups option is reflected in drawer

Verification steps