Add `Cluster` filter to the group/security center `Operational vulnerabilities` vulnerability report

Why are we doing this work

• users want to see operational vulnerabilities and filter by the cluster they come from at the group/security center level

Relevant links

• Design Issue
  • 

Non-functional requirements

• Documentation
• Testing:

Implementation plan

• frontend extend the cluster_filter

  • group-level
    • update the Group.clusterAgents(hasVulnerabilities: Boolean) vulnerability request to filter by clusterAgentId: [ClustersAgentID!]
    • modify Group.vulnerabilitySeveritiesCount to be used with clusterAgentId
  • security center
    • update the InstanceSecurityDashboard.clusterAgents(hasVulnerabilities: Boolean) vulnerability request to filter by clusterAgentId: [ClustersAgentID!]
    • modify InstanceSecurityDashboard.vulnerabilitySeveritiesCount to be used with clusterAgentId

• backend

  • group
    • modify Group.vulnerabilitySeveritiesCount to be used with clusterAgentId
  • security center
    • modify InstanceSecurityDashboard.vulnerabilitySeveritiesCount to be used with clusterAgentId

Verification steps

1. Ensure your GDK has a GitLab Ultimate license
2. Ensure your GDK is connected to the GitLab Runner
3. Follow these docs to set up the kubernetes agent
4. Clone test-cis-with-agentid and run the pipeline
5. Link the agent to a project
6. Run the pipeline to generate vulnerabilities
7. Navigate to the agent/group/security center vulnerability report
8. View the vulnerabilities