[REF] hr_holidays: simplify leave type configuration

Purpose of this commit is to simplify the configuration of leave type and
use the job of HR officers / manager by making options clearer and easier
to use.

Specifications for leave type :

 * display name as header;
 * remove accrual option from leave type. It is now configured directly
   on allocation requests;
 * add a "X days allocated" stmart button. If you set a general allocation
   of 20 days, the stat button will display 20 days. Even if you go update
   the allocation by employee after that. Purpose is to have the value of
   main allocation done in group, not individual cases of some employees;
 * add a "Group leaves" stmart button. It leads to a new leave requests
   in group mode where mode is visible;
 * have a unique allocation type field replacing the setting allowing to make
   leave or allocation as well as limit and negative fields;
 * limit leave duration encoding to two options, either day-based (allowing to
   take full days or half a day), either hours-based (allowing to take full
   days, half a day or some specific hours in a given day);

More technically

 * limit and negative fields are removed. It was confusing as limit set to
   True means you can actually exceed the limit). It can be computed based
   on allocation_type ('no' meaning you can bypass the limit);
 * request_unit is simplified. Day and half are merged into day;
 * accrual and balance limit are moved to allocation model;

Specifications for allocation requests

 * set accrual specific on allocation itself and not coming from the leave
   type configuration anymore. Indeed we now consider accrual to be done
   case by case independently from the leave type;
 * remove negative and balance_limit. Indeed we now consider people have to
   check by hand what is done by accrual;

Leave and allocation are slightly impacted by other changes, such as domain
for default leave types. Changes have been made as small as possible. Future
commits will still improve leave and allocation models and views, going
further in the cleaning process. Some tests are udpated to match the new
configuration of leave type.

This commit is linked to task ID 1876795 and PR #26571.

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