Replace deprecated axe-matchers gem with axe-core gems

[camillevilla]

JIRA issue link

DM-4214

Description - what does this code do?

• Address flaky accessibility test:

Terms and conditions not logged in user Should display the terms and conditions page
     Failure/Error: expect(page).to be_accessible.according_to :wcag2a, :section508

     Selenium::WebDriver::Error::JavascriptError:
       javascript error: axe is not defined
         (Session info: chrome=120.0.6099.109)
     # #0 0x5559a7986f83 <unknown>
     # ./spec/features/terms_and_conditions_spec.rb:72:in `block (3 levels) in <top (required)>'

• Upgrade from deprecated axe-matchers gem to Deque's axe-core-gems
  • axe-core-capybara
  • axe-core-rspec

Testing done - how did you test it/steps on how can another person can test it

Screenshots, Gifs, Videos from application (if applicable)

Link to mock-ups/mock ups (image file if you have it) (if applicable)

Acceptance criteria

• [ ]

Definition of done

• Unit tests written (if applicable)
• e2e/accessibility tests written (if applicable)
• Events are logged appropriately
• Documentation has been updated, if applicable
• A link has been provided to the originating JIRA issue
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs