BUG: infer_freq results in None with hourly timezone
BUG: DatetimeIndes.insert doesnt preserve name and tz
Merge pull request #7299 from sinhrks/insert

BUG: DatetimeIndex.insert doesnt preserve name and tz
Merge pull request #7371 from sinhrks/infer_test

BUG: infer_freq results in None for hourly freq with timezone
BUG: resample raises ValueError when NaT is included