Purpose

This pull request includes several changes to update the configuration for Application Insights from using the instrumentation key to using the connection string. The most important changes include updates to environment variables, configuration files, and application code.

Updates to environment variables and configuration files:

• README.md: Changed the environment variable from APPLICATIONINSIGHTS_INSTRUMENTATION_KEY to APPLICATIONINSIGHTS_CONNECTION_STRING.
• deploy/macae-continer-oc.json: Updated the parameter name from APPLICATIONINSIGHTS_INSTRUMENTATION_KEY to APPLICATIONINSIGHTS_CONNECTION_STRING.
• deploy/macae-continer.bicep: Changed the configuration to use APPLICATIONINSIGHTS_CONNECTION_STRING instead of APPLICATIONINSIGHTS_INSTRUMENTATION_KEY.
• src/backend/.env.sample: Replaced APPLICATIONINSIGHTS_INSTRUMENTATION_KEY with APPLICATIONINSIGHTS_CONNECTION_STRING.

Updates to application code:

• src/backend/app.py: Modified the code to retrieve APPLICATIONINSIGHTS_CONNECTION_STRING instead of APPLICATIONINSIGHTS_INSTRUMENTATION_KEY from environment variables.
• src/backend/event_utils.py: Updated the function to use APPLICATIONINSIGHTS_CONNECTION_STRING for tracking events.

Updates to tests:

• src/backend/tests/agents/test_human.py: Changed the test setup to use APPLICATIONINSIGHTS_CONNECTION_STRING instead of APPLICATIONINSIGHTS_INSTRUMENTATION_KEY. [1] [2]
• src/backend/tests/test_app.py: Updated the environment variable in tests to use APPLICATIONINSIGHTS_CONNECTION_STRING.

Does this introduce a breaking change?

• Yes
• No