Allow fetching of the priority of a validation error type

[evansiroky]

Checklist

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

Description

This PR will expose the priority level of validation errors through the GraphQL schema. This is needed in order to implement ibi-group/datatools-ui#477.

[codecov-io]

Codecov Report

Merging #269 into dev will increase coverage by 0.27%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                dev     #269      +/-   ##
============================================
+ Coverage     64.71%   64.99%   +0.27%     
- Complexity      864      866       +2     
============================================
  Files           134      134              
  Lines          6723     6725       +2     
  Branches        789      789              
============================================
+ Hits           4351     4371      +20     
+ Misses         2074     2055      -19     
- Partials        298      299       +1

Impacted Files	Coverage Δ	Complexity Δ
...veyal/gtfs/graphql/fetchers/ErrorCountFetcher.java	87.5% <100%> (+78.8%)	4 <0> (+2)	⬆️
...a/com/conveyal/gtfs/graphql/GraphQLGtfsSchema.java	98.27% <100%> (ø)	1 <0> (ø)	⬇️

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[landonreed]

I think the intent with the errorCountType definition below is to contain high-level information about the error type, including the count, english message and priority fields. I think this error priority fetcher should be removed because it's redundant information. Open to hearing a counter argument though.

[evansiroky]

I originally thought each error needed this info, but after implementing ibi-group/datatools-ui#527 I realized I didn't really need it. So yeah, I'll remove it.

[landonreed]

🎉 This PR is included in version 5.1.0 🎉

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