API v2 note update

[c8y3]

Implement endpoint PUT /api/v2/cases/{case_identifier}/notes/{identifier} to update a note.

• return 200 in case of success
• if the object is not found, return 404
• if the case is not found, return 404
• create method in business layer
• check returned object is uniform with other endpoints
• deprecate POST /case/notes/update/{note_id}
• openapi: document endpoint
• openapi: deprecate POST /case/notes/update/{note_id}

[c8y3]

• modify note_title
• return 400 when note_title is a string
• return 400 when directory_id does not belong to an existing directory

[c8y3]

• Fixed+test: PUT /api/v2/cases/{case_identifier}/iocs/{identifier} should return 404 when case_identifier does not correspond to any existing case
• Set up the redoc linter on the openapi documentation
• Fixed some warning of the redoc linter, many are still remaining. For now, they are ignored. Will fix gradually.