[Bug] Schema und Beispiele der Destination API passen nicht zusammen

Description of the bug:

1. name fehlt in den Endpunkten GET /v1/destinations/{destinationId} und PUT /v1/destinations/{destinationId}:
   1. Beispiel enthält "name": "Meine Destination"
   2. Schema enthält keine Property name
   3. Gleiches gilt für den Endpunkt
2. callback.secret fehlt im Request Body der Endpunkte POST /v1/destinations und PUT /v1/destinations/{destinationId}: Das Secret wird niemals wieder ausgegeben, zu Aktualisierung muss es jedoch überschreibbar sein.
3. ...

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Checklist:

• Add Severity label
• Add team label
• Related/affected issues/stories/epics linked and explained in the bug issue
• Creation of an automated test
• Bugfix deployed on DEV
• Bugfix tested on DEV
• Bugfix deployed on TEST
• Bugfix tested on TEST (possibly also by the connection project itself)
• Successful fix reported to Team Operations (Teams channel)
• Bugfix deployed on STAGE
• Bugfix tested on STAGE if necessary
• Bugfix deployed on PROD
• Bugfix tested on PROD (possibly also by the connection project itself)
• Final communication by Team Operations if necessary
• Internal documentation was checked and updated if necessary
• External documentation has been checked and updated if necessary
• Updated changelog if necessary

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