WASHINGTON — A highly anticipated report by the Justice Department’s inspector general is expected to sharply criticize lower-level F.B.I. officials as well as bureau leaders involved in the early stages of the Trump-Russia investigation, but to absolve the top ranks of abusing their powers out of bias against President Trump, according to people briefed on a draft. Investigators for the inspector general, Michael E. Horowitz, uncovered errors and omissions in documents related to the wiretapping of a former Trump campaign adviser, Carter Page — including that a low-level lawyer, Kevin Clinesmith, altered an email that officials used to prepare to...