feat(export-structures): "/formated" endpoint now returns an array of structures matching state format

Type also changed from boolean to string

Still remove an existing cnfsId when no meeting opened. 
No more 429 risks since it works now with one call to https://api.conseiller-numerique.gouv.fr/permanences.

Remove an existing cnfsID when not matching espace coop or rdvs meeting list. Call rdvs api when a match is found on espace coop to avoid too many request.

 Warning  : rdvs api might throw a 429 error when above 50 requests.