remove troublesome nsky_parts test

[mkolopanis]

removes the old test where we try to force nsky_parts.

We have a new test where we manually set it and we can check that the proper output is printed from that test.

[codecov[bot]]

Codecov Report

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

Project coverage is 99.86%. Comparing base (d4e76b3) to head (72154b3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #453 +/- ## ======================================= Coverage 99.86% 99.86% ======================================= Files 12 12 Lines 2234 2234 ======================================= Hits 2231 2231 Misses 3 3 ```

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