The tls files are stored as a json blob in the
SecureJsonData field. To update one file, the
json has to be fetched from the db first and
then updated with the cert file that has been
changed.

Also, a change to the dto with flags that are
used in the frontend to show if a file has
been uploaded. For example, if tlsClientKeySet
is set to true then means a file for the
client key is saved in the db. This is to
avoid sending any private data to the frontend.