Remove/replace Virtus models for EVSS - Part 1

[stevenjcumming]

Summary

• Replace Virtus model with Vets::Model
• Boolean changes to Bool (this avoids a naming conflict)
• The other Virtus models will be updated in another PR
• Some models where treated like hashes so they needed to be updated
  • For example rated_disability['decision_code'] vs rated_disability.decision_code
  • 2 Mobile legacy models needed that used EVSS models to be updated as well
• Vets::Model related updates addressed in a different PR that should be merged first
  • Add Attribute Inheritance to Vets::Model #18691

Related issue(s)

• Remove/replace Virtus models for EVSS va.gov-team#92632

Testing done

• manually testing to verify objects are the same with virtus and Vets::Model

Acceptance criteria

• model(s) don't use the virtus gem (not including Common::Base)

[va-vsp-bot]

Error: A file (or its parent directories) does not have a CODEOWNERS entry. Please update the .github/CODEOWNERS file and add the entry for the Offending file: lib/evss/pciu/email_address.rb

[stevenjcumming]

I switched Vets::Model from a class to a module and the last commit should reflect those changes

[jperk51]

mobile changes look good

[stevenjcumming]

Closed because EVSS is being deprecated