exclude abstract classes from test coverage

apiserver/security/user.py

@@ -45,7 +45,7 @@ class Secret(BaseModel):
     secret: str = None
 
 
-class AbstractDBInterface(metaclass=abc.ABCMeta):
+class AbstractDBInterface(metaclass=abc.ABCMeta): # pragma: no cover
     @abc.abstractclassmethod
     def list(self) -> List:
         raise NotImplementedError()

apiserver/storage/LocationStorage.py

@@ -17,7 +17,7 @@ class LocationData(BaseModel):
     metadata: Optional[Dict[str, str]]
 
 
-class AbstractLocationDataStorageAdapter:
+class AbstractLocationDataStorageAdapter: # pragma: no cover
     """
     This is an abstract storage adapter for storing information about datasets,
     storage targets and similar things. It can easily be expanded to also store