fix: conda environment counts as disabled with implicit decorator

[saikonen]

Fixes issue where conda environments are wrongly treated as disabled if the decorator is implicitly applied.

The underlying reason is that due to the lifecycle of decorators, the disabled attribute gets cast to string early enough, that the is_disabled check fails.

Can test this by slapping the following at the end of step_init in conda decorator

print(f"has conda decorator: {step} - disabled: {self.disabled} - type: {type(self.disabled)}")

closes #1667