Add Nested Environments into GraphQL Query

What does this MR do and why?

Adds the ability to query nestedEnvironments on a project to the GraphQL query

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How to set up and validate locally

Query nestedEnvironments field on a project with GraphQL

Example

Query

{
  project(fullPath: "root/test") {
    nestedEnvironments(states: ["available"]) {
      nodes {
        name
        size
        environment {
          name
          path
          externalUrl
        }
      }
    }
  }
}

Output

{
  "data": {
    "project": {
      "nestedEnvironments": {
        "nodes": [
          {
            "name": "example-env",
            "size": 3,
            "environment": {
              "name": "example-env",
              "path": "/root/test/-/environments/42",
              "externalUrl": null
            }
          },
          {
            "name": "production",
            "size": 3,
            "environment": {
              "name": "production/three",
              "path": "/root/test/-/environments/35",
              "externalUrl": null
            }
          },
          {
            "name": "prooduction",
            "size": 3,
            "environment": {
              "name": "prooduction",
              "path": "/root/test/-/environments/23",
              "externalUrl": null
            }
          },
          {
            "name": "staging",
            "size": 3,
            "environment": {
              "name": "staging/three",
              "path": "/root/test/-/environments/38",
              "externalUrl": null
            }
          },
          {
            "name": "test",
            "size": 3,
            "environment": {
              "name": "test/three",
              "path": "/root/test/-/environments/41",
              "externalUrl": null
            }
          }
        ]
      }
    }
  }
}

MR acceptance checklist

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

Related to #371952 (closed)