[IMP] hr_holidays: Improve usability

This commit improves screens usability in the Time Off app.
The following points have been changed:

1. For leaves and allocations, add buttons on the kanban
card to directly approve or refuse if it's not already
validated.

2. On the leave kanban card, only display the dates,
not the full datetime.

3. Add a description to the activity created when a
leave/allocation needs to be approved by someone.

4. Allocation are now sorted in the list view, more recent firsts.

5. In the allocation form view, add a stat button to know
how many leaves has been allocated and how many has been taken
for the allocation leave type. The button redirects to the employee's
leaves of the leave type. Only shown for holiday type 'emloyee'.

6. In the leave form view, there are currently two duration fields
for managers. The readonly duration is an informative field for regular
employees and the editable duration is meant for managers, it's used if
the number of days needs to be manually set for some reason.
Make sure the manager only sees the editable duration fields.

7. From "My Dashboard", the creation form view should not be the
manager form view (default view) which has additional unecessary fields
when requesting a leave for yourself (`employee_id`, `holiday_type`, ect).
It's now showing the form view for regular employees.

Task 1961713

0 files changed, 0 insertions, 0 deletions