enh(ci): update sheldon to print error with cspell

Description

Up to now cspell error are not treated as sheldon errors. It is hereafter made compulsory to success cspell to success sheldon.

In addition several logs have been removed, to have only the success log or the error lines.

Closes #57 (closed)

How to test it?

Make an error in a file.

Apply sheldon, and check that it does not succeed.