fix: Resolve user-assigned identity issue, add quota check, remove hard-coded location

[Abdul-Microsoft]

Purpose

• This pull request adds support for reusing existing Azure resources during deployment, improves parameterization and resource naming in infrastructure templates, and updates authentication handling in the backend to use a managed identity client ID. Documentation is also updated to guide users through reusing existing Log Analytics Workspaces and Azure AI Foundry Projects.

Deployment and Resource Reuse Improvements

• Added support for reusing existing Log Analytics Workspaces and Azure AI Foundry Projects by introducing new deployment parameters and updating documentation with step-by-step guides (docs/DeploymentGuide.md, docs/re-use-log-analytics.md, docs/re-use-foundry-project.md). [1] [2] [3] [4] [5]
• Infrastructure templates (infra/main.bicep, infra/main.parameters.json, infra/main.waf.parameters.json) now accept parameters for model name, version, deployment type, and capacity, allowing more flexible and customizable deployments. [1] [2] [3] [4] [5] [6]

Authentication and Managed Identity

• Backend code now consistently passes AZURE_CLIENT_ID to get_azure_credential for Cosmos DB and Azure AI clients, improving authentication reliability with managed identities (src/backend/app_config.py, src/backend/config_kernel.py, src/backend/context/cosmos_memory_kernel.py, src/backend/utils_kernel.py). [1] [2] [3] [4] [5]
• The managed identity client ID is now injected into container app environment variables for proper resource access (infra/main.bicep).

Error Handling and Miscellaneous

• Improved error messaging for rate limits in the backend, making quota issues clearer to users (src/backend/app_kernel.py). [1] [2]
• Added the azure-ai-agents dependency for new agent capabilities (src/backend/pyproject.toml).
• Minor documentation and code comments updates for clarity and best practices (src/backend/app_kernel.py).

Does this introduce a breaking change?

• Yes
• No

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Other Information

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🎉 This PR is included in version 2.2.0 🎉

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