Don't run on_validation_epoch_end() during sanity checking if val-accuracy-interval is greater than max epochs.

[bw4sz]

In https://deepforest.readthedocs.io/en/v1.4.1/user_guide/09_configuration_file.html#val-accuracy-interval, we tell users that to turn off the validation callback, set the interval to greater than the number of epochs.

DeepForest/src/deepforest/main.py

Line 718 in e5f3301

if self.current_epoch % self.config["validation"]["val_accuracy_interval"] == 0:

But that's not quite true, because during sanity checking the self.current_epoch = 0, this means it still checks the line above, there is no reason and is probably dangerous, to check the validation dataloader if we don't intend on ever calling it during training.

More on sanity checking

https://lightning.ai/forums/t/validation-sanity-check/174

https://pytorch-lightning.readthedocs.io/en/0.9.0/api/pytorch_lightning.trainer.evaluation_loop.html

1. We need to test and document and check the current behavior.
2. Update docs with what is actually happening.

This issue should wait on the refactor of #858