Enable FF "paginated_tree_graphql_query" by default

What does this MR do and why?

Contributes to #337214 (closed)

It enables FF paginated_tree_graphql_query by default

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

UI

1. Open a project with non-empty repository
2. Verify that the list of files and folders in present without any errors

GraphQL Explorer

1. Open graphql-explorer: http://localhost:3000/-/graphql-explorer
2. Execute a following query (replace fullPath value with a path to your project)

{
  project(fullPath: "root/my-awesome-project") {
    repository {
      paginatedTree {
        nodes {
          blobs {
            nodes {
              name
            }
          }
        }
      }
    }
  }
}

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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