Domain verification certificate failure notifications should not be sent to entire group

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Proposal

The Verified domains for groups feature currently sends notifications to the entire group for events related to the domain setup and certificate creation. For example when the (not required) Pages certificate creation fails, emails are sent as a group notification:

domain | ACTION REQUIRED: Something went wrong while obtaining the Let's Encrypt certificate for GitLab Pages domain {domain name}

This is less than desirable as typically it would be an individual owner configuring the domain, sending emails to the entire group can lead to concern and confusion for the group members.

Ideally this experience could be improved by:

1. Sending notifications to only the user configuring the domain, or perhaps limiting to group owners

2. Making certification creation optional. If you are only verifying the domain and do not require a real Pages site why the need for a cert? The documentation states

   A valid certificate is not required for domain verification. You can ignore error messages regarding the certificate if you are not using GitLab Pages.

Much better to avoid the issue in the first place.