Fix role integration test

[senthalan]

Purpose

Fix integration test failure caused with #555

[Copilot]

Pull Request Overview

This PR adds user schema management to the role API integration tests. The user schema is required for creating test users, which are then used in various role assignment tests.

• Introduces testUserSchema definition with a "person" type schema
• Adds user schema creation in SetupSuite and cleanup in TearDownSuite
• Adds userSchemaID variable to track the created schema for cleanup

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.88%. Comparing base (edc921e) to head (bc6b1d0).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #642       +/-   ##
===========================================
+ Coverage   31.68%   66.88%   +35.19%     
===========================================
  Files         205      205               
  Lines       18788    18788               
  Branches      255      250        -5     
===========================================
+ Hits         5953    12566     +6613     
+ Misses      12550     4835     -7715     
- Partials      285     1387     +1102     

Flag	Coverage Δ
backend-combined-postgres	55.29% <ø> (?)
backend-combined-sqlite	55.29% <ø> (?)
backend-integration-postgres	55.29% <ø> (?)
backend-integration-sqlite	55.29% <ø> (?)
backend-unit	31.68% <ø> (ø)
frontend-apps-develop-unit	31.68% <ø> (ø)

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