chore(auth): prefill the login form on demo instances

[JosephKav]

for https://release-argus.io/demo

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.63%. Comparing base (3e5b669) to head (6545852).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1000      +/-   ##
==========================================
+ Coverage   99.63%   99.63%   +0.01%     
==========================================
  Files         226      226              
  Lines       14344    14385      +41     
==========================================
+ Hits        14290    14331      +41     
  Misses         54       54              

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[github-actions]

✅ Playwright Test Results

	Count
✅ Passed	479
❌ Failed	0
🔄 Flaky	1
⏭️ Skipped	4

Duration: 955.1s

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