Fix/onix xform file save

[keegansmith21]

• Updated filter to properly include published date
• Adds more testing for the filter because things keep sneaking past me
• Fixed bug in onix_utils that looked in the wrong spot for saved file

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 93.59%. Comparing base (dce4bc3) to head (6a5b222).

:exclamation: Current head 6a5b222 differs from pull request most recent head 9f6ac5f. Consider uploading reports for the commit 9f6ac5f to get more accurate results

Files	Patch %	Lines
dags/oaebu_workflows/onix_utils.py	55.55%	2 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #219 +/- ## ========================================== - Coverage 93.72% 93.59% -0.14% ========================================== Files 14 14 Lines 2807 2810 +3 Branches 353 355 +2 ========================================== - Hits 2631 2630 -1 - Misses 97 99 +2 - Partials 79 81 +2 ```

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