[PM-11780] Resolve TypeScript 5.3 compile error

[coroiu]

📔 Objective

Tweaks code to compile on TS 5.3. @cagonzalezcs I believe you added this code, could you take a look that it still does what it's supposed to?

Tip: You can play around with the typings here TypeScript Playground

📸 Screenshots

⏰ 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 – 0a01c092-87f6-4f3e-981f-3b355a27d205

No New Or Fixed Issues Found

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 35.07%. Comparing base (6484460) to head (4579541).
Report is 105 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...r/browser-api.register-content-scripts-polyfill.ts	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #11215    +/-   ##
========================================
  Coverage   35.07%   35.07%            
========================================
  Files        2710     2718     +8     
  Lines       84542    84836   +294     
  Branches    16064    16135    +71     
========================================
+ Hits        29653    29759   +106     
- Misses      53918    54099   +181     
- Partials      971      978     +7     

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[cagonzalezcs]

This code handles dynamically setting the content scripts for FIDO2 behavior based on the user's setting.

I pulled the code down, ran a build for Mv2 (which is affected by this change), and tested that passkeys can be enabled/disabled dynamically as expected.

Everything looks good from my side.