Indicate validation issue priority in validation table

[landonreed]

In the list of validation issues for a given feed version, there is no indication of priority given to the various issue types. In other words, there is no way to distinguish whether an issue could be considered an error vs. a warning -- e.g., something that would break feed ingestion by a third party service vs. just affect how a name field might be rendered.

We already have a measure of priority stored in the gtfs-lib class that deals with validation issues. We just need to display this in the UI using either the binary error vs. warning classification or the multi-tiered priority classification.

[landonreed]

🎉 This issue has been resolved in version 4.1.0 🎉

The release is available on GitHub release

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