Remove deprecated cosima_cookbook references from ACCESS-NRI catalog tutorial (#608)

* remove cosima_cookbook references

* 4cpus

* Update list all variables function

* Fix show all variables script

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Co-authored-by: Charles Turner <charles.turner@anu.edu.au>
Co-authored-by: Charles Turner <52199577+charles-turner-1@users.noreply.github.com>

Author: navidcy