Refactor popUpToCompleteRegistration to use type-safe KClass reference

[SaintPatrck]

🎟️ Tracking

TBD

📔 Objective

Fixes a crash caused when popping up to the CompleteRegistrationRoute.

⏰ 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 – 054d15bc-ec99-4d6f-9814-057e4e02fdd8

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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.30%. Comparing base (47b9509) to head (8034188).

Files with missing lines	Patch %	Lines
...leteregistration/CompleteRegistrationNavigation.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6480   +/-   ##
=======================================
  Coverage   86.30%   86.30%           
=======================================
  Files         780      780           
  Lines       56351    56351           
  Branches     8149     8149           
=======================================
  Hits        48635    48635           
  Misses       4876     4876           
  Partials     2840     2840           

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