Fix security approvals not showing

What does this MR do and why?

Fix security approvals not showing

• replace groupApprovers with allGroupApprovers
• this instance was missed in Display inaccessible approval groups in policy ... (!128129 - merged)

Changelog: fixed

EE: true

Screenshots or screen recordings

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Upload a GitLab Ultimate license
2. Navigate to a project/group => Secure => Policies => New policy => Scan Result Policy
3. Create a policy and merge it
4. Navigate to the project/group => Settings => Merge Request => Security Approvals
5. Verify the policy appears

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #414994 (closed)