Revert "Merge branch 'ia-email-intelligence-service' into 'master'"

What does this MR do and why?

Revert "Merge branch 'ia-email-intelligence-service' into 'master'"

This reverts merge request !160308 (merged)

The MR is causing 400 errors:

• https://new-sentry.gitlab.net/organizations/gitlab/issues/954778/?alert_rule_id=10&alert_type=issue&environment=gprd&notification_uuid=1cd8c138-42b3-42ee-a47d-4a9c4b548e27&project=3&referrer=slack

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