fix: MFA enforce flows / interactions

[matmair]

Improve MFA experience when MFA enforcement gets enabled.

• All users are logged out when mfa enforcement is changed
• There is an explanation os-level alert before that happens
• The mandatory MFA registration now works on new logins
• Fix single-form login with password managers

Closes #10754
Closes #11122

[netlify]

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[codecov]

Codecov Report

❌ Patch coverage is 91.89189% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.11%. Comparing base (07e1a72) to head (d83deab).
⚠️ Report is 295 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10796      +/-   ##
==========================================
- Coverage   88.17%   88.11%   -0.07%     
==========================================
  Files        1290     1290              
  Lines       58203    58273      +70     
  Branches     1969     1968       -1     
==========================================
+ Hits        51319    51345      +26     
- Misses       6393     6437      +44     
  Partials      491      491              

Flag	Coverage Δ
backend	89.46% <91.89%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Backend Apps	92.01% <ø> (ø)
Backend General	93.49% <91.66%> (-0.03%)	⬇️
Frontend	70.83% <ø> (-0.02%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing matmair:fix_mfa_enforce_sessions (d83deab) with master (07e1a72)}

Summary

✅ 44 untouched benchmarks
⏩ 29 skipped benchmarks¹

Footnotes

1. 29 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[matmair]

@SchrodingersGat ready for review and maybe also a trial. I have spent a lot of time testing this, but maybe I have overseen some edge case.

[SchrodingersGat]

@matmair nice work, looks good from my testing. Thanks for fixing this!