Graphql query for framework coverage summary

What does this MR do and why?

Graphql query for framework coverage summary

This commit adds a graphql query to check framework coverage summary for a group

EE: true Changelog: added

This will support frontend chart to get coverage data for all frameworks

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Set up a compliance framework for a group and apply on some projects within the group and its subgroups
2. Use below query to fetch coverage data and verify it is correct

query getGroups {
  group(fullPath: "your-group-path") {
    id
    fullPath
    description
    complianceFrameworkCoverageSummary{
      totalProjects
      coveredCount
    }
  }
}

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Related to #542409 (closed)