Add vulnerability management policies to edit framework page

What does this MR do and why?

Related #507848 (closed)

Add vulnerability management policies to edit framework page, guarded behind the group-level feature flag vulnerabilityManagementPolicyTypeGroup.

It follows Add vulnerability management policies to framew... (!176267 - merged).

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Before	After

How to set up and validate locally

1. Enable group level vulnerability management policy feature flag vulnerability_management_policy_type_group
2. In a group > Secure > Compliance center > Frameworks tab > Create a framework
3. In same group > Secure > Policies > New policy > Click vulnerability management policy tile > Fill in name and in policy scope: Apply policy to "projects with compliance framework" and select your created compliance framework
4. Save policy and merge MR
5. Go to compliance center > frameworks tab
6. Click on ellipsis icon for framework > click on edit
7. Expand the policies section and validate it shows the vulnerability management policy