updated utilStages to util_stages

[eacharles]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8b13147) 81.36% compared to head (0c612f2) 81.36%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #26 +/- ## ======================================= Coverage 81.36% 81.36% ======================================= Files 7 7 Lines 719 719 ======================================= Hits 585 585 Misses 134 134 ```

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[eacharles]

Fixes outstanding errors in unit tests coming from change of utilStages to util_stages and from downloading sfd dustmap.

[sschmidt23]

whoops, hit return before typing, looks good, thanks Eric.