[BI-2878] Germplasm External UID missing from UI

[davedrp]

BI-2878 Germplasm External UID missing from UI
Dependencies

bi-api: feature/BI-2878

Testing

1. Import Germplasm with both a Seed Source and a External UID
2. Go to Germplasm page (list of all Germplasm).
   Expected Result:

• The External UID should be displayed for the newly imported Germplasm.

3. Press the Lists tab.
4. Press the Details link for the newly imported Germplasm List.
   Expected Result:

• The External UID should be displayed for the newly imported Germplasm.

Checklist:

• I have performed a self-review of my own code
• I have tested my code and ensured it meets the acceptance criteria of the story
• I have commented my code, particularly in hard-to-understand areas
• I have either updated the source of truth or arranged for update with product owner if needed https://breedinginsight.atlassian.net/wiki/spaces/BI/pages/1559953409/Source+of+Truth
• I have run SiteImprove on pages impacted by changes

[jloux-brapi]

The changes as described look fine, and they test according to what is in the MR.

However, the UI displays this field as a sortable and filterable column, and the functionality does not work when used.

We should decide if we need that functionality, and if we do, fix it, or remove the functionality entirely from this column if it is not needed.