Revert bump-email-verification-timeout' into 'master'

What does this MR do and why?

Revert "Merge branch 'avonbertoldi/incident-17404/bump-email-verification-timeout' into 'master'"

This reverts merge request !142078 (merged)

This change was a temporary measure due to slow email delivery. Based on the fact that we've now resolved gitlab-com/gl-infra/production#17404 (closed) and it seems email delivery should be well under 60 minutes now.

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