Notify administrators if the users are blocked/IDLE for a long time

[sidoruka]

• Cloud Pipeline shall check the list of users who are blocked or "IDLE" for a long period of time. This shall allow to remove their data to minimize the storage costs and block those users, who are already not using the platform
• Two checks shall be performed:
  • Users who are "IDLE" - did not login for a N days (included those, who never logged)
  • Users who are Blocked for M days
  • Users who are members of the group, which is Blocked for M days
  • N and M shall be configurable via preferences
• This check shall be performed on a scheduled basis. Schedule shall be configurable via preferences
• If any users match the "IDLE/Blocked" criteria - a email notification shall be sent. Introduce a new email notification type, which shall support adding a list of the users as a table to the email body.
• This table shall contain the following information:
  • User ID (meaning a "NameID", not an integer ID)
  • Email (if available)
  • User's default storage name (if available)
  • Creation date/time
  • Last login date/time
  • Blocked date/time

[mzueva]

@sidoruka @rodichenko backported to release/0.16