Fix Conda directive is not honoured by task array

[pditommaso]

This PR fixes the usage of conda directive with task arrays.

Solves #5694

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[bentsherman]

I need to update the docs for this. I think I didn't include conda in the list because the conda environment is normally handled by the task script. So each task could have a different conda environment. But with Wave, the conda environment needs to be uniform for the process because Wave uses conda to resolve the container image beforehand