[IMP] hr_contract: remove dependency to base_automation

Purpose of this commit is to remove the link between Hr Contracts and
base automation. This has two consequences

 * automated actions used to compute contracts state are transformed
   into scheduled actions. Crons will do the job just as fine;
 * option to use employee contract in automated actions is removed
   and put in its own bridge module;

This allows to remove the dependency between the two addons.

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