Send Reminder if Timesheet Not Filled or Less Than 8 Hours Logged

[KanchanChauhan]

Check if team members have filled their timesheet for the previous working day. If a timesheet is incomplete or if logged hours are less than 8, and Send previous day reminder to fill the timesheet is checked on Slack Settings, send a reminder with the following message:
"You tracked only {{no of hours}} yesterday. Please fill in your timesheet."

Conditions to check:

• If the timesheet is not filled for the previous working day.
• If the total logged working hours for the previous day is less than 8.

[ananyo141]

As discussed with @niraj2477, we have to

• Using an email template in Slack Settings to get the notification format
• Checking user permissions with .get_list() and get details like Project, Task for user