[IMP] sale_timesheet: Invoicing wizard improvements

Purpose of this task is, the invoicing wizard is being able to
define a period with a start and an end date would allow a bit
more flexibility.

Currently, the invoicing wizard allows to invoice timesheets
up to a certain date.It is links all timesheets before or equals
this date in the sale order are invoiced.

In this commit, we add  another date field so that the user can
define a period with a start and an end date and rename the
'invoice timesheets up to' field into 'Timesheets Period'. Also,
use widget 'Daterange'  in both fields and update tooltips
accordingly this fields. By default we leave this two field empty.

After this commit behaviour of invoicing wizard:
 -If these fields are empty, include all timesheets without
  distinction in the invoice
 -If these fields are set, only include the timesheets that fall
  within this period in the invoice
 -If applicable, only include approved timesheets

TaskId:2252798
Closes: #52073

0 files changed, 0 insertions, 0 deletions