Additional feed summary params

[br648]

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 JavaDoc 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

Update to provide additional parameters to the UI via feed summary. This now contains two new parameters:

1. latestSentToExternalPublisher
2. publishState (enum)

In order to get Gtfs plus validation into feed version, validation now takes places (via ValidateGtfsPlusFeedJob) in the same places as mobility data validation. This only happens with new feed versions and is not backwards compatiable, therefore gtfs plus validation won't be available for older feed versions.