[REF] hr_holidays: improve leave form view and simplify duration encoding

Purpose of this commit is to simplify leave request encoding. We want less
options and more straightforward encoding of leave requests.

Specifications

 * taking half-day leaves is limited to one half day. It is not possible
   anymore to take leaves in half days that span on several days. WHen
   choosing half day the user choose whether he takes the morning or the
   afternoon of the given day;
 * choosing half-days leaves spanning on several days can be done taking
   several leaves if necessary. It is considered as a corner case that should
   not bloat the interface;
 * taking hours-based leaves is limited to a given day. It is not possible
   anymore to take leaves given some start and end hours that span on several
   days. When choosing hours the user choose the start and end hours using
   a selection for every half-hour for the given day;
 * choosing hours-based leaves spanning on several days can be done taking
   several leaves if necessary. It is considered as a corner case that should
   not bloat the interface;
 * taking leaves spanning on several days is necessarily done with full
   length days;

Various misc specifications about form view cleaning

 * hide "To submit" stage in the stage bar;
 * move description below duration information;
 * remove display name;

Duration computation, various fields and form view are updated accordingly
to this specification.

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

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