By David Shepardson WASHINGTON (Reuters) – The U.S. government said it faces “significant harm” if an a appeals court fails to reverse an injunction barring enforcement of President Joe Biden’s COVID-19 vaccine mandate for government workers, and that testing unvaccinated employees could cost up to $22 million a month. White House Office of Management and Budget Deputy Director Jason Miller disclosed in an declaration cited late on Monday by the Justice Department that the government would be hurt on several fronts if it cannot enforce the vaccine requirements. “While most federal civilian emp…