Sync GitHub Actions workflow with Azure DevOps pipeline changes

[zhenyulin]

Motivation

• Align GitHub Actions with the updated Azure DevOps (.ado) pipeline naming, file paths, and packaging behavior to ensure parity between CI systems.
• Use newer action versions and improve caching/install steps to match the .ado templates and current best practices.

Description

• Updated environment variables and secrets to use Azure-style names, e.g. RESOURCE_GROUP -> AZURE_RESOURCE_GROUP, added CONFIG_PROJECT_NAME, and set BICEP_FILE to .infra/functions.bicep in ci-cd-pipeline.yaml.
• Upgraded action versions and cache behavior: actions/checkout@v4, actions/setup-python@v5, actions/cache@v4, actions/download-artifact@v4, consolidated pip cache to ${{ github.workspace }}/.pip-cache, and improved cache keys.
• Split install steps to set PIP_CACHE_DIR, install uv, then run uv sync, and added dependency install step for clarity.
• Adjusted packaging and artifact handling to create functionapp.zip at ${GITHUB_WORKSPACE}, publish it as function-zip, include zip creation, and update deploy logic to resolve BICEP_FILE path and use CONFIG_PROJECT_NAME and the new env names when calling az deployment and azure/webapps-deploy.
• Added Azure-related envs to the pytest step so tests can access required service credentials when run in CI.

Testing

• No automated CI tests were executed as part of this change.

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Codex Task