Move TestHelpers to core test-fixtures module

[david-livefront]

🎟️ Tracking

N/A

📔 Objective

This PR moves the TestHelpers file to the Core module test-fixtures.

⏰ 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 – 0103bb58-3aba-4f4d-a1e3-0fe92a1d6aa0

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.50%. Comparing base (674cde9) to head (175a9d9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6314      +/-   ##
==========================================
+ Coverage   84.93%   85.50%   +0.56%     
==========================================
  Files         876      763     -113     
  Lines       56942    54601    -2341     
  Branches     7900     7855      -45     
==========================================
- Hits        48366    46684    -1682     
+ Misses       5833     5189     -644     
+ Partials     2743     2728      -15     

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