Class attribute is used, but does not exist

In the AbstractRun class, it is tried to use the [class variable models_dir](https://github.com/automl/DeepCAVE/blob/1851126c064a3120299250fb39b2c00d00abbc2e/deepcave/runs/__init__.py#L615C31-L615C31), which does not exist in this class, nor in its superclass.
[It does exist in the Run class](https://github.com/automl/DeepCAVE/blob/1851126c064a3120299250fb39b2c00d00abbc2e/deepcave/runs/run.py#L121) in the same package as AbstractRun, if this variable is meant, it needs to be accessed accordingy.

Start by reading deepcave/runs/__init__.py at the AbstractRun use of models_dir around line 615, then compare it with the definition in deepcave/runs/run.py around line 121. Confirm which class attribute is intended and verify that the corrected access matches the existing class structure without raising an attribute error.

Written by the indexing model from the issue text.