Add negated iteration wildcard filtering for work items

What does this MR do and why?

Add negated iteration wildcard filtering for work items

Adds support for filtering work items that are NOT in the current iteration using the negated iteration_wildcard_id filter.

Also refactors work_items_data helper to conditionally include project-specific data like releases_path.

Changelog: added EE: true

References

Relates to #557888 (closed) #557887 (closed)

Sample query

query q {
  project(fullPath: "twitter/Typeahead.Js") {
    workItems( not: { iterationWildcardId: ANY } ) {
      nodes {
        id
        webUrl
      }
    }
  }
}

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