Background: https://github.com/aicers/github-dashboard-server/pull/175/files#r2151563763

Problem:
The following query is limited to fetching only the first 10 assignees:

assignees(first: 10) {
  nodes {
    login
  }
}

If an issue has more than 10 assignees (e.g. 11), the remaining ones are not fetched.
This limitation affects all GitHub GraphQL queries that use fixed pagination values. The solution should be generalized to handle pagination across all such cases.