Also include CC'ed users from reply emails

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From #4652 (comment 1837131700)

It seems that the feature works as expected for people in Cc of the initial email that triggers the issue creation and the thank_you.md auto reply.

My observation is about people being added in Cc within a subsequent discussion by email.

Consider adding CC'ed users from reply emails (both thank_you and new_note).

Summary

Users in CC for replies to Service Desk thank_you and new_note are not added as external participants.

This should be available since 17.0 per this comment: #4652 (comment 1902976859).

Steps to reproduce

1. Create a project on GitLab.com
2. Obtain the Service Desk email
3. Send an email and wait for the default thank_you email
4. Reply to the thank_you email with an email in CC

What is the expected correct behavior?

Emails added to CC in thank_you and new_note email are added to the issue created as external participants.