Add empty state for debug menu without feature flags

[david-livefront]

🎟️ Tracking

N/A

📔 Objective

This PR updates the debug menu for both the Password Manager and Authenticator.

• Support better UI when there are no feature flags.
• Use Immutable Maps as state.
• Use dummy flags for testing to avoid breaking tests when removing flags.

⏰ 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 – 142b6932-4363-4826-9276-98b34a99bbc0

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

[codecov]

Codecov Report

❌ Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.27%. Comparing base (98530ed) to head (63fa0ee).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ature/debugmenu/components/FeatureFlagListItems.kt	0.00%	1 Missing and 1 partial ⚠️
...ature/debugmenu/components/FeatureFlagListItems.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5918   +/-   ##
=======================================
  Coverage   84.27%   84.27%           
=======================================
  Files         712      712           
  Lines       53625    53626    +1     
  Branches     7387     7389    +2     
=======================================
+ Hits        45190    45192    +2     
- Misses       5832     5843   +11     
+ Partials     2603     2591   -12     

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[SaintPatrck]

👍

[david-livefront]

Thanks @SaintPatrck