GAP-1596: properly sort error messages from back end

[GavCookCO]

Description

Fixing the sort order on question responses where multiple errors may appear on the screen at once. Previously these were just displayed in whatever order the code encountered the validation error but now they appear in the same order as the form.

Ticket # and link
GAP-1596

Summary of the changes and the related issue. List any dependencies that are required for this change:
Added a couple of methods to the controller exception handler to sort messages before they are returned back through the API

Type of change

Please check the relevant options.

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes:

• Unit Test

• Integration Test (if applicable)

• End to End Test (if applicable)

Screenshots (if appropriate):

Please attach screenshots of the change if it is a UI change:

Checklist:

• If I have listed dependencies above, I have ensured that they are present in the target branch.
• I have performed a self-review of my code.
• I have commented my code in hard-to-understand areas.
• I have made corresponding changes to the documentation where applicable.
• I have ran cypress tests and they all pass locally.

[paul-lawlor-tco]

Have left minor comment - happy to approve whether it gets implemented or not!