[UI] Adjust "superuser warning" banner

[SchrodingersGat]

• fix typo: evelevated -> elevated
• visual tweaks
• adds some playwright tests
• adds new settings to control display of banner(s)

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[matmair]

This defeats half of the purpose of this. As we recently learned the hard way: the “staff” user flag is also dangerous and should be guarded. Not warning against it will lead to ppl not reading the docs and being unaware of the risky thing they are doing by using a user with that flag

[SchrodingersGat]

I 100% agree for a superuser - but IMO operating as a staff user is expected.

Otherwise, does every "staff" user need a secondary account for their day-to-day operations?

[matmair]

given the current security boundaries for templates: yes

[SchrodingersGat]

I have added two separate settings to control this then. They can be hard-coded via environment variables - as with any other setting.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.39%. Comparing base (4b3b03e) to head (7a5a36d).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #11696   +/-   ##
=======================================
  Coverage   91.39%   91.39%           
=======================================
  Files         966      966           
  Lines       50050    50050           
=======================================
  Hits        45742    45742           
  Misses       4308     4308           

Flag	Coverage Δ
backend	89.27% <ø> (ø)

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Components	Coverage Δ
Backend Apps	91.73% <ø> (ø)
Backend General	93.41% <ø> (ø)
Frontend	∅ <ø> (∅)

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