fix: Reverting the open telemetry changes in api_routes.py

[Abdul-Microsoft]

Purpose

This pull request removes telemetry and logging-related functionality from the src/backend/api/api_routes.py file, simplifying the codebase and reducing dependencies. The most significant changes include removing Application Insights configuration, eliminating the use of OpenTelemetry for tracing, and removing event tracking calls throughout the API endpoints.

Removal of telemetry and logging functionality:

• Removed Application Insights configuration and logging setup, including suppression of specific loggers and the use of environment variables for instrumentation keys. (src/backend/api/api_routes.py)
• Eliminated all OpenTelemetry tracing code, including span creation, exception recording, and status setting in API endpoints. (src/backend/api/api_routes.py) [1] [2] [3]

Removal of event tracking:

• Removed calls to track_event_if_configured across multiple endpoints, such as start_processing, download_files, batch_status_updates, and others. These calls previously logged events like "ProcessingStart" and "FileUploaded". (src/backend/api/api_routes.py) [1] [2] [3] [4]

General cleanup:

• Removed unused imports related to telemetry and logging, such as opentelemetry, azure.monitor.opentelemetry, and logging. (src/backend/api/api_routes.py)
• Removed redundant blank lines and minor formatting adjustments to improve code readability. (src/backend/api/api_routes.py) [1] [2] [3]

These changes streamline the code by removing dependencies and functionality that are no longer required, making the API routes easier to maintain.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

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Other Information

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🎉 This PR is included in version 1.4.1 🎉

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