feat: prompt logging & AI feature preferences

[jimniels]

Feature

• Allow users to turn AI-related features on or off at the team level (on by default)
  • Only can be turned on/off by team owners
• Log user prompts

TODO

• Need a link to a community post that talks about prompt logs (the one we can link to from the UI)
  • Links to https://docs.quadratichq.com/security#ai-data-privacy-setting

To Test

• Team owners of a team can turn the setting on/off
• Team viewers/editors cannot see the setting
• ...

---

Other things included in this PR:

• Preparations to update react-router to major version 7. This primarily means upgrading to the latest 6.x version and adding all the necessary feature flags. We can ship this, and in a future release, assuming we don't get any bugs, do the rest of what's necessary to upgrade to version 7. Note: react-router v7 will require node 20, so we'll have to make sure to make that update. While that really just means updating to node 20 for building the app, we also use node on the server and should upgrade that too while we're at it.
• Support visiting /logout directly to log out of the app
• Remove TEAM_DELETE and TEAM_BILLING_EDIT so now TEAM_MANAGE is inclusive of both of these, plus turning AI features on/off

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.11%. Comparing base (4172c38) to head (57f3c67).

Additional details and impacted files

@@              Coverage Diff               @@
##           ayush/2075    #2163      +/-   ##
==============================================
- Coverage       91.11%   91.11%   -0.01%     
==============================================
  Files             296      296              
  Lines           62660    62660              
==============================================
- Hits            57093    57092       -1     
- Misses           5567     5568       +1     

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