State immunity — Jurisdictional immunity — Restrictive immunity — Proceedings with respect to employment contract — Whether United Arab Emirates immune from suit — Foreign Sovereign Immunities Act 1976 — Section 1605(a)(2) — Commercial activity exception — Whether applicable — Whether plaintiff civil servant under Act — Whether plaintiff’s work involving exercise of distinctly governmental powers — Nature of work — Irrelevance of purpose — Whether Act shielding United Arab Emirates from suit — The law of the United States