[PM-17610] Remove getUserId operator

[BTreston]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-17610

📔 Objective

This PR fixes the error that gets thrown by the getUserId custom rxjs operator in instances where we rely on null/undefined being unhandled.

📸 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

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 35.28%. Comparing base (146939b) to head (920f271).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...s/common/src/platform/sync/default-sync.service.ts	0.00%	2 Missing ⚠️
libs/common/src/platform/sync/core-sync.service.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13091   +/-   ##
=======================================
  Coverage   35.28%   35.28%           
=======================================
  Files        2997     2997           
  Lines       90873    90871    -2     
  Branches    16966    16966           
=======================================
  Hits        32067    32067           
+ Misses      56318    56316    -2     
  Partials     2488     2488           

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