Figure out some way to document the dataUrl being used for a NameLookup instance

[gaurav]

We've kinda assumed that this would be documented in the download.sh file, but that's no longer the case, since our SOP is now to upgrade the Helm chart with dataUrl=''. So our options are:

1. We write the dataUrl to the Solr PVC and then emit it to logs when we set it up: cumbersome.
2. We log the dataUrl to the web instance as well, which should not change when the dataUrl changes: difficult to test, may be fragile.
3. We change the SOP so that instead of saying dataUrl='' we say loadData=false or something: will require changes on ITRB
4. We change the SOP so that instead of saying dataUrl='' we say dataUrl='' prevDataUrl='...': will require changes on ITRB anyway, and will be difficult to maintain manually.
5. ???