FE: Create "Groups" selection

Why are we doing this work

• Users want to be able to select a group from a dropdown

Relevant links

• Design Issue
  • 

Implementation plan

• MR 1
  • frontend Retrieve the project's groups in .../security_orchestration/components/policy_editor/scan_result_policy/policy_action_builder_v2.vue
• MR 2
  • frontend Retrieve all the groups in the instance and allow the user to select from that list using the graphql endpoint created from Scan Result Policy - `group_approvers` string m... (#378234 - closed)

Verification steps

1. Upload a GitLab Ultimate license
2. Enable the :scan_result_role_action feature flag with the below command

echo "Feature.enable(:scan_result_role_action)" | rails c

3. Navigate to a project/group => Security & Compliance => Policies => New policy => Scan Result Policy
4. Verify a user can select Groups in the Actions area and the dropdown for selecting the groups displays the correct information