PM-24747 remove chromium importer feature flag

[harr1424]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-24747?atlOrigin=eyJpIjoiMWI3NTRkOTM2MzkwNDIzYmE4OGRhZDQ4NGQ3MDYwNTYiLCJwIjoiaiJ9

📔 Objective

Remove feature flag “pm-23982-chromium-importer" from server and clients

⏰ 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 – 55573bec-413d-40e2-bbed-7213a8d9cb3e

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@f75ad36). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6415   +/-   ##
=======================================
  Coverage        ?   50.35%           
=======================================
  Files           ?     1853           
  Lines           ?    82393           
  Branches        ?     7265           
=======================================
  Hits            ?    41490           
  Misses          ?    39320           
  Partials        ?     1583           

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