breaking: fix N818 Exception name QTKException should be named with…

… an Error suffix

src/qtoolkit/core/exceptions.py

@@ -1,22 +1,22 @@
-class QTKException(Exception):
+class QTKError(Exception):
     """Base class for all the exceptions generated by qtoolkit."""
 
 
-class CommandFailedError(QTKException):
+class CommandFailedError(QTKError):
     """
     Exception raised when the execution of a command has failed,
     typically by a non-zero return code.
     """
 
 
-class OutputParsingError(QTKException):
+class OutputParsingError(QTKError):
     """
     Exception raised when errors are recognized during the parsing
     of the outputs of command.
     """
 
 
-class UnsupportedResourcesError(QTKException):
+class UnsupportedResourcesError(QTKError):
     """
     Exception raised when the resources requested are not supported
     in qtoolkit for the chosen scheduler.