Don't ship 0 `departure_time` unless specified by user

[miles-grant-ibigroup]

Checklist

• [x] Appropriate branch selected (all PRs must first be merged to dev before they can be merged to master)
• [x] Any modified or new methods or classes have helpful JSDoc and code is thoroughly commented
• [x] The description lists all applicable issues this PR seeks to resolve
• [x] The description lists any configuration setting(s) that differ from the default settings
• [x] All tests and CI builds passing

Description

Follow-up to https://github.com/ibi-group/datatools-ui/pull/836. Shipping a default 0 departureTime for pattern stop stop times is fine, but for pattern locations this cause unwanted behavior. This PR only ships 0 if the stop time is a pattern stop, otherwise it sends a null.

[miles-grant-ibigroup]

Throwing a blocked on here until we figure out what's going on with these e2e tests