[PM-8498] Moving content script-specific FIDO2 code from Vault to Autofill ownership

[cagonzalezcs]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-8498

📔 Objective

Moving the Fido2Background class and content scripts specific to Fido2 behavior to Autofill team ownership.

⏰ 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 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 28.18%. Comparing base (28e8f8f) to head (6ac35d3).

Files	Patch %	Lines
apps/browser/src/background/main.background.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9431   +/-   ##
=======================================
  Coverage   28.18%   28.18%           
=======================================
  Files        2434     2434           
  Lines       71663    71663           
  Branches    13394    13394           
=======================================
  Hits        20195    20195           
  Misses      49875    49875           
  Partials     1593     1593           

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[github-actions]

Checkmarx One – Scan Summary & Details – d8938770-1fe9-4e61-b861-3bad90643c23

New Issues

Severity	Issue	Source File / Package	Checkmarx Insight
	Angular_Improper_Type_Pipe_Usage	/apps/browser/src/vault/popup/components/fido2/fido2-use-browser-link.component.html: [1](https://github.com/bitwarden/clients/blob/autofill/pm-8498-move-fido2-content-script-code-to-autofill-team//apps/browser/src/vault/popup/components/fido2/fido2-use-browser-link.component.html# L1)	Attack Vector