POC 2 query approach for vulnerability grouping

What does this MR do and why?

POC for 2 query approach for vulnerability grouping.

Related to: #422203 (closed)

Have limited to query to projects alone, and we require an equivalent work for groups as well during development.

Screenshots or screen recordings

1st query to support list by groups with counts by severity. Can use a GraphQL query as proposed below:

{
  project(fullPath: "root/mr-link-on-branch") {
    name
    vulnerabilityGroupCountBySeverity(reportType: SAST, grouping: STATUS) {
      groups
      counts
    }
  }
}

2nd query to support the expansion action. Can use the already available query vulnerabilities

{
  project(fullPath: "root/mr-link-on-branch") {
    name
    vulnerabilities(reportType: SAST, state: DETECTED, first: 20) {
      nodes {
        id
        title
        description
      }
    }
  }
}

How to set up and validate locally

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

MR acceptance checklist

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Related to #422203 (closed)