Moved crossref dataset creation to metadata table task

[keegansmith21]

The crossref dataset creation was under the second-run crossref task - so the first one would run into an error if it doesn't already exist

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (bee243c) 95.34% compared to head (a35e4be) 95.34%. Report is 1 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #173 +/- ## ======================================== Coverage 95.34% 95.34% ======================================== Files 16 16 Lines 2383 2383 Branches 309 309 ======================================== Hits 2272 2272 Misses 69 69 Partials 42 42 ``` | [Files Changed](https://app.codecov.io/gh/The-Academic-Observatory/oaebu-workflows/pull/173?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The-Academic-Observatory) | Coverage Δ | | |---|---|---| | [oaebu\_workflows/workflows/onix\_workflow.py](https://app.codecov.io/gh/The-Academic-Observatory/oaebu-workflows/pull/173?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The-Academic-Observatory#diff-b2FlYnVfd29ya2Zsb3dzL3dvcmtmbG93cy9vbml4X3dvcmtmbG93LnB5) | `96.60% <100.00%> (ø)` | |

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