Adding Troubleshooting Info for GH007 Error during gh-gei Migration

[aatmmr]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/migrations/using-github-enterprise-importer/completing-your-migration-with-github-enterprise-importer/troubleshooting-your-migration-with-github-enterprise-importer#troubleshooting-failed-migrations

What part(s) of the article would you like to see updated?

Running a test migration with gh-gei revealed that I had activated the option "Block command line pushes that expose my email" in my profile email settings which produced the error [ERROR] Git source migration failed with the info GH007: Your push would publish a private email address. The solution was not directly obvious to me and it took some time and research that pointed me to that option. I was not aware that it was set in my profile. So it might help users to solve this error faster.

Additional information

No response

[cmwilson21]

@aatmmr Thank you for opening an issue and linking it to your PR! ✨