Update Azure Search client configuration with audience for national c…

[dayland]

This pull request introduces several changes to the app/backend/app.py, app/enrichment/app.py, and infrastructure files to enhance logging, add new configuration variables, and update dependencies. The changes are grouped into improvements to logging, configuration updates, and dependency updates.

Improvements to logging:

• Added multiple debug log statements in the poll_queue function to provide more detailed information about the processing stages and potential errors. (app/enrichment/app.py) [1] [2] [3]

Configuration updates:

• Added AZURE_SEARCH_AUDIENCE to environment variables and updated its usage in StatusResponse and index_sections functions to include the new audience parameter. (app/backend/app.py, app/enrichment/app.py) [1] [2] [3] [4]
• Updated Terraform configuration to include AZURE_SEARCH_AUDIENCE and modified the module "enrichmentApp" and module "webapp" to use the new variable. (infra/main.tf) [1] [2]
• Added a new variable azure_search_scope in Terraform variables file. (infra/variables.tf)

Dependency updates:

• Updated azure.search.documents from version 11.4.0b11 to 11.5.1 in the requirements.txt file to ensure compatibility with the new audience parameter. (app/enrichment/requirements.txt)…louds