Additional feed summary params

[br648]

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Description

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

1. latestProcessedByExternalPublisher
2. latestSentToExternalPublisher
3. latestGtfsPlusValidation (issues and published)

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.

[josh-willis-arcadis]

can we add publishedVersionId here? The UI uses this to display the published version column in the feed source table component.