Add compliance frameworks to namespace in GraphQL API

What does this MR do?

Adds a new feature flag

• :ff_custom_compliance_frameworks

Adds the ability to traverse the graph from NamespaceType to ComplianceManagement::ComplianceFrameworkType

Example

query {
  namespace(fullPath: "root-group") {
    id
    name
    complianceFrameworks {         
      nodes {
        id
        name
        description
        color
      }
    }
  }
}

Preserves the ability to traverse the graph from ProjectType to ComplianceManagement::ComplianceFrameworkType

This is a non-breaking change

Example

query {
  projects {
    nodes {
      id
      name
      complianceFrameworks {
        nodes {
          name
          description
          color
        }
      }
    }
  }
}

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Related to #255340 (closed)