feat: Supprimer mailjet

[Guilouf]

Quoi ?

Supprimer tout ce qui concerne Mailjet

Pourquoi ?

Mailjet n'est plus utilisé pour envoyer des emails avec template

Comment ?

Attirer l'attention sur les décisions d'architecture ou de conception importantes.

TODO

• Penser à nettoyer les varenv clevercloud
• TENDERS_PARTNER_PRESENTATION
• Dans SiaeSearchResultsDownloadView, plus d'ajout à contact_list ?
• Siae pas ajouté à la contact list dans leur création depuis emploi inclusion
• Les emails envoyés par EMAIL_BACKEND sont toujours maijet ?

[gitguardian]

️✅ There are no secrets present in this pull request anymore.

If these secrets were true positive and are still valid, we highly recommend you to revoke them.
While these secrets were previously flagged, we no longer have a reference to the
specific commits where they were detected. Once a secret has been leaked into a git
repository, you should consider it compromised, even if it was deleted immediately.
Find here more information about risks.

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^{_{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}}

[madjid-asa]

LGTM