GraphQL: Implement not arg in BulkLabelsResolver Label Filtering

What does this MR do and why?

This mr introduces the :not argument in the BulkLabelsResolver. It now supports both exact string matches and wildcard-end-of-string patterns ('*') for label exclusion. Labels matching the specified patterns in the :not array are effectively filtered out from the results. Changelog: added

This enhancement is particularly useful in scenarios where labels are dynamically generated or follow a certain naming convention (like group:*). By allowing exclusions, we can reduce clutter in the query results and present only the labels that are of interest to the user, thereby improving the overall api experience.

Performance Considerations

The negated argument should not affect performance as the labels are filtered based on exclusion criteria before being loaded by BatchLoader.

Testing

I couldn't find a specific spec for BulkLabelResolver, so I've created bulk_labels_resolver_spec.rb, let me know if there's a better place to put those tests.

How to set up and validate locally

1. Set up MR 4 in flightjs/Flight with labels for testing, those can be Highlander and a few group:* labels.
2. Use the fallowing query to call the API:

query MyQuery {
  project(fullPath: "flightjs/Flight") {
    id
    name
    mergeRequest(iid: "4") {
      id
      labels(first: 10, not: ["group*", "Highlander"]) {
        nodes {
          title
          description
          lockOnMerge
        }
      }
    }
  }
}

The response should exclude the negated labels:

Query Response

{
  "data": {
    "project": {
      "id": "gid://gitlab/Project/7",
      "name": "Flight",
      "mergeRequest": {
        "id": "gid://gitlab/MergeRequest/33",
        "labels": {
          "nodes": [
            {
              "title": "4Runner",
              "description": null,
              "lockOnMerge": false
            },
            {
              "title": "Aquanix",
              "description": null,
              "lockOnMerge": false
            },
            {
              "title": "Aquasche",
              "description": null,
              "lockOnMerge": false
            },
            {
              "title": "Technix",
              "description": null,
              "lockOnMerge": false
            },
            {
              "title": "Villager",
              "description": null,
              "lockOnMerge": false
            }
          ]
        }
      }
    }
  }
}

Signed-off-by: Lucas Zampieri lzampier@redhat.com