Move the creation of the parent policy list url to the backend

Why are we doing this work

The following discussion from !131223 (merged) should be addressed:

• @aturinske started a discussion:

  I forgot that the security policies code manually creates the urls to parent namespaces; that should probably be moved to the backend. I will create an issue for that.

Relevant links

Non-functional requirements

• Documentation:
• Feature flag:
• Performance:
• Testing:

Implementation plan

• create the parent policies list url in https://gitlab.com/gitlab-org/gitlab/-/blob/977b56d6e87f2e7ed536c99579e457ef4e55389e/ee/app/views/projects/security/policies/index.html.haml and https://gitlab.com/gitlab-org/gitlab/-/blob/977b56d6e87f2e7ed536c99579e457ef4e55389e/ee/app/views/groups/security/policies/index.html.haml and pass it up to the frontend
• remove usage of getSecurityPolicyListUrl in https://gitlab.com/gitlab-org/gitlab/-/blob/e24503a2853ee21ec1187dbe683c43362930faa4/ee/app/assets/javascripts/security_orchestration/components/policies/list_component.vue for source url

Verification steps