[HOLD] move backoff settings, send email, and create client to config

[AlbertSnows]

PR on hold until https://github.com/uc-cdis/fence/pull/1182 is merged Link to JIRA ticket if there is one: https://ctds-planx.atlassian.net/browse/PXP-11392

This PR moves config properties and functions out of utils into config. Utils should be low-level, and thus not reference other namespaces for sake of not inducing circular dependencies.

New Features

Breaking Changes

Bug Fixes

Improvements

• move some config properties and variables out of utils into config

Dependency updates

Deployment changes