refactor: move submit en_construction logic to the model

[tchak]

No description provided.

[what-the-diff]

PR Summary

• Introduction of a new method enhancing process handling
  A new code method called 'submit_en_construction!' was added to the Dossier model. This method simplifies certain sequential processes, such as transitioning to 'construction' status, saving file updates, computing routing, and resolving pending corrections if required. It also sets the 'conservation extension' attribute to 0 days, removing any extensions to this stage.

• Refinement of the control mechanism
  The method 'submit_en_construction' within the DossiersController has been updated. It now utilizes the aforementioned 'submit_en_construction!' method, providing a more streamlined and efficient process control, replacing the previous logic which was less efficient.

[E-L-T]

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