Add a "reset API secret" button

[MarcelWaldvogel]

There is currently no way to create a new API secret from the GUI. As this is a shared value, it probably needs even more change than a password (e.g. after giving the secret to someone to conduct tests :-))

[MarcelWaldvogel]

@sualko Please add the "enhancements" label

[MarcelWaldvogel]

A manual way to delete an exposed API secret is to run the following command as the web user in the nextcloud directory:

php ./occ config:app:delete ojsxc apiSecret

A new secret should the be created on the next registration. Please do not change your hosting location URL and the apiSecret at the same time, as at least one needs to be the same for the re-registration to reuse the existing settings.