Merge branch 'ms-sd-add-read-timeout-to-custom-email-errors' into 'master'

Adds read_timeout to Service Desk custom email verification errors

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/136856



Merged-by: Michał Wielich <mwielich@gitlab.com>
Approved-by: Alex Pennells <apennells@gitlab.com>
Approved-by: Jacques Erasmus <jerasmus@gitlab.com>
Approved-by: Michael Becker <11881043-wandering_person@users.noreply.gitlab.com>
Approved-by: Michał Wielich <mwielich@gitlab.com>
Reviewed-by: Michael Becker <11881043-wandering_person@users.noreply.gitlab.com>
Co-authored-by: Marc Saleiko <msaleiko@gitlab.com>