Entity List template CSV gets opened and saved by Excel as not UTF-8

[lognaturel]

Steps to reproduce the problem

1. Download an Entity List template CSV
2. Double click to open in Excel
3. Populate a cell with non-ASCII characters (e.g. Hélène)
4. Save from Excel
5. Upload the Entity List CSV

Screenshot

Expected behavior

Excel opens and saves the file as UTF-8

Central version shown in version.txt

versions:
67bd0ad3def294a89fc17a8be8e1001a37303f80 (v2024.1.0-15-g67bd0ad)
+3372015d4fe4ba34598ab5e4552c1ec1e11ee205 client (v2024.1.0-41-g3372015d)
 3ae8a69011f3839b60ecc9fdda770faa408d16d4 server (v2024.1.0-35-g3ae8a690)

Other notes (if any)

This is related to #752. I think that in this case we can add the BOM because this template exists just to make it easier to input data. We generally don't expect the template to be ingested into data pipelines or edited by scripts.