chore/SRE-583 Deprecate usage of Auth-Email Header

[bitwarden-charlie]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/SRE-583

📔 Objective

Deprecate usage of Auth-Email Header

Server side changes: bitwarden/server#5709

⏰ 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 – 531a1738-de50-4150-ad4f-d732983e9a42

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.58%. Comparing base (244feb4) to head (f462b6b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1528      +/-   ##
==========================================
- Coverage   88.59%   88.58%   -0.01%     
==========================================
  Files         810      810              
  Lines       51276    51270       -6     
==========================================
- Hits        45426    45420       -6     
  Misses       5850     5850              

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[fedemkr]

🤔Additionally to what Matt commented, should this be behind a feature flag so we can better control when to disable the code? Not sure when this was deprecated on server, but there may be people using old self-host server versions and they will need the header to perform a good request.

[sneakernuts]

🤔Additionally to what Matt commented, should this be behind a feature flag so we can better control when to disable the code? Not sure when this was deprecated on server, but there may be people using old self-host server versions and they will need the header to perform a good request.

This is a good call out. Server-side deprecation was done here bitwarden/server#5709

We are past the support window according to https://bitwarden.com/help/bitwarden-software-release-support/

[vvolkgang]

Added the server PR to the description. @fedemkr are you ok with the changes?