chore: main to dev downmerge

[Ragini-Microsoft]

Purpose

This pull request primarily updates documentation and environment files to improve clarity and accuracy for deploying the solution, especially for VS Code Web and Azure environments. It also provides guidance for users of the latest azd version and corrects template and script references.

Deployment and environment configuration updates:

• Added a new .env template in infra/vscode_web/.env for Azure deployments, including placeholders for agent ID, environment name, subscription ID, endpoint, and project resource ID. Also set AZD_ALLOW_NON_EMPTY_FOLDER=true to allow deployment in non-empty folders.
• Updated infra/vscode_web/install.sh to use the correct template (microsoft/content-generation-solution-accelerator) for azd init, replacing the previous document generation accelerator reference.

Documentation improvements:

• Updated VS Code Web launch links in README.md and docs/DEPLOYMENT.md to ensure consistency and accuracy across all relevant sections. [1] [2] [3]
• Added a note in docs/AZD_DEPLOYMENT.md for users running azd version 1.23.9, instructing them to disable preflight provisioning with azd config set provision.preflight off before running azd up.

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.