Add "projects with no DORA data" count to performanceScoreCount GraphQL collection

backend of #419490 (closed)

Add a collection type for performanceScoreCounts that leverages the resolver collection and expose it in GraphQL.

See #419490 (comment 1514791436) for suggested code.

GraphqL query:

query {
  group(fullPath: "vsmg-1692160029") {
    name
    doraPerformanceScoreCounts {
      noDoraDataProjectsCount
      nodes {
        highProjectsCount
        lowProjectsCount
        mediumProjectsCount
        noDataProjectsCount
      }
    }
  }
}