Export email download link incorrect

[bferguso]

The default email indicating the export is ready for download now has a download link, however the link is incorrect. Should either remove the download link or correct the download URL.

Emails are currently disabled for BCRHP so this is only an issue for BCFMS for now.

[bferguso]

I have a potential solution in place which involves a couple of changes:

1. Updating Arches Core to split the PUBLIC_SERVER_ADDRESS from the WEBPACK_SERVER_ADDRESS (PUBLIC_SERVER_ADDRESS value can have conflicting requirements archesproject/arches#11723)
2. Changing the logic that creates the email URL to generate the target S3 URL rather than an Arches internal URL.

Some things to consider:

1. Is it OK to put the S3 URL directly in the email? NB - the URLs are publicly available anyway.
2. The authorization key for access to the S3 store is likely shorter than the length of time the export file will be accessible. Need to update the email description to reflect that.