Revert updates to Microsoft.Extensions dependencies from v9

[trmartin4]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-16875

📔 Objective

We are seeing odd behavior on startup of the 2025.5.0 deployment that seems to indicate that there's problems reading from configuration. The theorized culprit is that the Microsoft.Extensions updates to v9 (or their transitive dependencies) are not playing nicely with the fact that we haven't done a full .NET v9 update.

This PR reverts those updates from #5072 and #5073.

📸 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

All modified and coverable lines are covered by tests ✅

Project coverage is 43.75%. Comparing base (90740c3) to head (80cc0fa).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5235   +/-   ##
=======================================
  Coverage   43.75%   43.75%           
=======================================
  Files        1476     1476           
  Lines       68146    68146           
  Branches     6172     6172           
=======================================
  Hits        29816    29816           
  Misses      37032    37032           
  Partials     1298     1298           

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[audreyality]

👍🏻 Checked vs the last revisions for the files and it matches up!

[github-actions]

Checkmarx One – Scan Summary & Details – e101b4a4-7f0d-408d-8a39-bcdc4862e0cd

No New Or Fixed Issues Found