Add currentRole to Health Summary Report at /health

[Copilot]

Why make this change?

Adds currentRole to the /health endpoint response header to surface the effective role of the requesting user, enabling easier authentication testing without needing external tooling to inspect request headers.

What is this change?

• ComprehensiveHealthCheckReport: New currentRole string property (JSON: "currentRole") inserted after timestamp in the report header.
• HealthCheckHelper.GetHealthCheckResponseAsync: Sets CurrentRole from the already-stored _incomingRoleHeader; falls back to "anonymous" when no role header is present.

Example response shape:

{
  "status": "Healthy",
  "version": "1.x.x",
  "app-name": "dab_oss_1.x.x",
  "timestamp": "2026-02-24T22:28:30Z",
  "currentRole": "anonymous",
  "configuration": { ... },
  "checks": [ ... ]
}

How was this tested?

• Integration Tests
• Unit Tests

Sample Request(s)

GET /health
X-MS-API-ROLE: authenticated

Response will include "currentRole": "authenticated" in the header section of the report. Omitting the header yields "currentRole": "anonymous".

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Enh]: Add to Health Summary</issue_title>
<issue_description>## What?

1. Add to the header part of the Health Summary Report returned at /health a scalar property "currentRole" which returns the current role "anonymous", "authenticated", etc.

Why?

To help with authentication testing.</issue_description>

<agent_instructions>with as little new code as possible</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [Enh]: Add to Health Summary #3157

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