chore: Fix linter warnings about hardcoded passwords

[gzurowski]

• Stop using hardcoded passwords in tests. Instead generate a dummy password (using UUIDs) in most tests.
• In more specific tests that verify authentication, use a valid random password (containing characters, digits and special characters).
• Add linter ignore annotations to hardcoded passwords that are supposed to fail password rules.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.50%. Comparing base (4ab9230) to head (8016319).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2087      +/-   ##
==========================================
+ Coverage   66.47%   66.50%   +0.03%     
==========================================
  Files         427      428       +1     
  Lines       23929    23961      +32     
==========================================
+ Hits        15907    15936      +29     
- Misses       8022     8025       +3     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.8% Duplication on New Code

See analysis details on SonarQube Cloud