feat: DAH-3055 Send user id and timestamp with every push

[chadbrokaw]

Description

The user_id and timestamp will now be sent with every event. In the case that the user is not signed in, we will send undefined for the user_id value. This will allow us to have more information about user behavior and leverage GA's user_id tracking feature.

Jira ticket

https://sfgovdt.jira.com/browse/DAH-3052

Before requesting eng review

Version Control

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Code quality

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