Backend logic for SignleKitaSignup and ServiceSignup

[Darjusch]

SingleKitaSignup writes user with Kita into Database and triggers Email. ( Collection name right now "user" )

Interface

email: string;
consentId: string;
id:  string;
kitaName: string;
kitaDesiredAvailability: string;
createdAt: string (ISO Date);
consentedAt: string (ISO Date) 

ServiceSignup writes user into Database and triggers Email. ( Collection name right now "emailService")

Interface

email: string;
consentId: string;
fullAddress: string;
desiredStartingMonth: string;
actualOrExpectedBirthMonth: string;
createdAt: string (ISO Date);
consentedAt: string (ISO Date)