[GetLogFileUsage] Read log folder on Exchange server

...instead of running remotely using UNC path. Huge performance gains:
435s vs 15s for a single database & there are>100 databases.
[GetLogFileUsage]
Revert "[GetLogFileUsage]"

This reverts commit be7101922e9fbd71cd9abb2bda35926b3ffb3965.
[GetLogFileUsage] Add "-Server region" option
[GetLogFileUsage] Refactor #1

Move data collection into Get-DailyExchangeLogStats
[GetLogFileUsage] Cosmetic change
[GetLogFileUsage] Add Connect-Exchange
[GetLogFileUsage] Remove unavailable sessions in Connect-Exchange
[GetLogFileUsage] Add Get-LogFolderPath
[GetLogFileUsage] Cosmetic