fix(security): Only allow System Administrators to create users

[seakayone]

Fixes a severe security problem. Anonymous users were able to create System Administrator account.

Pull Request Checklist

Task Description/Number

PR Type

• build/chore: maintenance tasks (no production code change)
• docs: documentation changes (no production code change)
• feat: represents new features
• fix: represents bug fixes
• perf: performance improvements
• refactor: represents production code refactoring
• test: adding or refactoring tests (no production code change)

Basic requirements for bug fixes and features

• Tests for the changes have been added
• Docs have been added / updated

Does this PR introduce a breaking change?

• Yes

Does this PR change client-test-data?

• Yes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (eac5751) 11.74% compared to head (bfab7a0) 11.33%.
Report is 45 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3022      +/-   ##
==========================================
- Coverage   11.74%   11.33%   -0.41%     
==========================================
  Files         246      258      +12     
  Lines       22907    22848      -59     
==========================================
- Hits         2690     2590     -100     
- Misses      20217    20258      +41     

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[mpro7]

Let's get back to secured!