PM-16705: Improve the node validation logic

[david-livefront]

🎟️ Tracking

PM-16705

📔 Objective

This PR updates the accessibility event node logic to utilize the RootNode instead of the source node if the source node is null. This helps us combat issues where the the node is null when the event comes through but we do not receive another event.

This does cause performance to suffer a little bit but a recent change that checks for the accessibility action first mitigates the worst aspects of this performance issue.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – d94876c8-e7f0-4ddf-a185-323c0f344f22

Great job, no security vulnerabilities found in this Pull Request

[david-livefront]

Thanks @SaintPatrck

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.61%. Comparing base (d5c0412) to head (496f714).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5250      +/-   ##
==========================================
- Coverage   82.67%   82.61%   -0.07%     
==========================================
  Files         686      689       +3     
  Lines       51218    51320     +102     
  Branches     6937     6937              
==========================================
+ Hits        42347    42399      +52     
- Misses       6567     6618      +51     
+ Partials     2304     2303       -1     

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