Django Users with @example.com emails should be updated to users' actual email

[cdw9]

We have about 60 valid Django users in the site that have a generic @example.com email address on their account. These Django users are what Library and LibraryVersions use for designating the authors and maintainers. These should be updated to match the email on their associated CommitAuthor.

The purpose of this is to fix instances on the libraries where the author or maintainer name is not listed

[cdw9]

I started looking at the data for this on prod. It's going to be easiest to start with a script to at least start with a script that will gather all the data. Get all the example.com accounts, and check for CommitAuthors with the same name