stages/email: use uuid for email confirmation token instead of username (cherry-pick #7581)

[gcp-cherry-pick-bot]

Cherry-picked stages/email: use uuid for email confirmation token instead of username (#7581)

Signed-off-by: Jens Langhammer jens@goauthentik.io

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Lighthouse	1 paths audited Performance: 90 (🔴 down 7 from production) Accessibility: 90 (no change from production) Best Practices: 100 (no change from production) SEO: 80 (no change from production) PWA: - View the detailed breakdown and full score reports

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8d95612) 92.59% compared to head (e47d71a) 92.58%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           version-2023.10    #7584      +/-   ##
===================================================
- Coverage            92.59%   92.58%   -0.02%     
===================================================
  Files                  587      587              
  Lines                28900    28901       +1     
===================================================
- Hits                 26761    26757       -4     
- Misses                2139     2144       +5     

Flag	Coverage Δ
e2e	50.93% <100.00%> (-0.01%)	⬇️
integration	26.01% <50.00%> (+<0.01%)	⬆️
unit	89.58% <100.00%> (-0.02%)	⬇️

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