Add verification_level to GraphQL CatalogResourceType

What does this MR do and why?

Add verification_level to GraphQL CatalogResourceType

Closes #434059 (closed)

Query:

query getCiCatalogResourceDetails {
  ciCatalogResource(id: "gid://gitlab/Ci::Catalog::Resource/1") {
    id
    name
    verificationLevel
    webPath
    starCount
    latestVersion {
      id
    }
    latestReleasedAt
    icon
  }
}

Response:

{
  "data": {
    "ciCatalogResource": {
      "id": "gid://gitlab/Ci::Catalog::Resource/1",
      "name": "Resource 2",
      "verificationLevel": "GITLAB",
      "webPath": "/gitlab-org/gitlab-test",
      "starCount": 0,
      "latestVersion": null,
      "latestReleasedAt": "2022-01-12T09:45:00Z",
      "icon": null
    }
  }
}

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