Added a structured request-logging smoke test through app startup #572

[Rakshak05]

Closes #572

Description

This PR introduces a top-level integration/smoke test to ensure that request IDs and structured JSON logging are correctly integrated and function end-to-end through application startup.

Specifically, the following changes were made:

• Added a logger.info("Health check endpoint accessed") call inside the /api/v1/health endpoint in main.py to ensure request-level logs are emitted during the request cycle.
• Created testing/backend/integration/test_request_logging_smoke.py containing:
  • An integration test (test_request_id_appears_in_json_logs) checking that a generated request ID matches the one returned in response headers and is successfully correlated in the output JSON logs.
  • A passthrough test (test_passthrough_request_id) verifying that pre-existing request IDs sent in headers are propagated and correctly logged.
  • An in-memory logging capture fixture (log_capture) using the real application's RequestIDFilter and JSONFormatter.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

The smoke test was run and verified locally:

python -m pytest testing/backend/integration/test_request_logging_smoke.py