G4.114 Finalize processValidationMessages() to generate user-friendly messages

[carolyncaron]

Issue #114

Dependent on PR #123

Motivation

This PR is meant to tackle changes needed to processValidationMessages() in the Traits Importer. Once the feedback validation engine has been upgraded to expect a render array to display validation errors to the user, then processValidationMessages() is updated to create those render arrays for each validator that fails.

What does this PR do?

1. For each validator that is instantiated by the Traits Importer, create a new method that chooses the appropriate render array type/markup, takes the contents of $failures[$validator_name] and plugs them into the appropriate places of the render array, and finally returns the finished render array.
2. Update processValidationMessages() to no longer loop through all of the failed validators, and instead checks each validator if a failure occurred and calls the correct method to build the render array.

Testing

Automated Testing

Please describe each automated test this PR creates and provide a list of the assertions it makes using casual language.
Do not just say things like "asserts the array is not empty" but rather say "Ensures that the return value of method X with these parameters is not an empty array".

ClassName->testSpecificBug: tests this specific bug

Manual Testing

Describe in detail how someone should manually test this functionality.
Make sure to include whether they need to build a docker from scratch, create any records, etc.