API v2 delete note

[c8y3]

Implement endpoint DELETE /api/v2/cases/{case_identifier}/notes/{identifier} to delete a note.

• return 204 in case of success
• return an empty body in case of success
• if the case is not found, return 404
• if the note is not found, return 404
• create method in the business layer
• deprecate POST /case/notes/delete/{note_id}
• openapi: document endpoint
• openapi: deprecate POST /case/notes/delete/{note_id}

[c8y3]

• fixed: PUT /api/v2/cases/{case_identifier}/notes/{identifier} should return 403 when user has no access to case
• return 403 when user is denied permission to case
• DELETE /api/v2/cases/{case_identifier}/notes/{identifier} returns 404, after delete