Add `ClusterImageScanningType` to `VulnerabilitiesResolver`

What does this MR do and why?

Describe in detail what your merge request does and why.

This merge request adds a new ClusterImageScanningType to the VulnerabilitiesResolver GraphQL query. This allows the GraphQL query to begin returning location data for Cluster Image Scanning Vulnerabilities.

Issue: #347081 (closed)

This supports the displaying of Operational Vulnerabilities in the GitLab UI, being implemented as part of &6345 (closed).

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How to set up and validate locally

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

1. Make your GDK has an EE license

2. Setup GitLab Runner in Docker mode and make sure a runner is registered to your group.

3. Commit a .gitlab-ci.yml file to your project with the following content:

   cluster_image_scanning:
     image: alpine:latest
     script:
       - apk add --update curl
       - curl -O https://gitlab.com/-/snippets/2218294/raw/main/gl-cluster-image-scanning-report.json
     artifacts:
       reports:
         cluster_image_scanning: gl-cluster-image-scanning-report.json
       paths: [gl-cluster-image-scanning-report.json]

4. Go to http://localhost:3000/-/graphql-explorer

5. Paste the following query:

   query vulnerabilities($fullPath: ID!) {
     project(fullPath: $fullPath) {
       vulnerabilities {
         nodes {
           id
           title
           description
           location {
             __typename
             ... on VulnerabilityLocationClusterImageScanning {
               image
               operatingSystem
               dependency {
                 version
                 package {
                 name
                 }
               }
               kubernetesResource {
                 namespace
                 kind
                 name
                 containerName
                 agent {
                   id
                   name
                   webPath
                 }
               }
             }
           }
         }
       }
     }
   }

6. In the query variables set:

   {
     "fullPath": "path/to/your/project"
   }

7. Run the query

8. Query returns Cluster Image Scanning location data

   {
     "data": {
       "project": {
         "vulnerabilities": {
           "nodes": [
             {
               "id": "gid://gitlab/Vulnerability/689",
               "title": "CVE-2020-36331 in libwebp6",
               "description": "libwebp: out-of-bounds read in ChunkAssignData() in mux/muxinternal.c",
               "location": {
                 "__typename": "VulnerabilityLocationClusterImageScanning",
                 "image": "index.docker.io/library/nginx:1.14.2",
                 "operatingSystem": null,
                 "dependency": {
                   "version": "0.5.2-1",
                   "package": {
                     "name": "libwebp6"
                   }
                 },
                 "kubernetesResource": {
                   "namespace": "default",
                   "kind": "ReplicaSet",
                   "name": "nginx-deployment-66b6c48dd5",
                   "containerName": "nginx",
                   "agent": {
                     "id": "gid://gitlab/Clusters::Agent/1",
                     "name": "test-agent",
                     "webPath": "/root/starboard-vuln/-/cluster_agents/test-agent"
                   }
                 }
               }
             }
           ]
         }
       }
     }
   }

MR acceptance checklist

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