fix: Replace Bicep DeploymentScripts with post-deployment setup scripts

[Abdul-Microsoft]

Purpose

• This pull request introduces a new post-deployment setup process for configuring the Function App client key and creating PostgreSQL tables, and updates documentation to guide users through these steps. It also removes deployment-time scripts and parameters related to PostgreSQL table creation from the infrastructure code, delegating this responsibility to the new post-deployment script. Additionally, a new Python script is added to automate PostgreSQL table setup, and several documentation files are updated with clear instructions for running these scripts. Minor infrastructure cleanups and simplifications are also included.

Post-deployment automation and documentation:

• Added a new Python script, setup_postgres_tables.py, which creates required PostgreSQL tables and vector extension for chat and vector storage, authenticating with Azure credentials.
• Updated documentation (README.md, docs/AVMPostDeploymentGuide.md, docs/LOCAL_DEPLOYMENT.md, docs/NON_DEVCONTAINER_SETUP.md) to instruct users to run the post-deployment setup script for configuring the Function App client key and setting up PostgreSQL tables, including handling of private networking scenarios. [1] [2] [3] [4] [5]

Infrastructure (Bicep) simplification and cleanup:

• Removed deployment-time scripts (pgSqlDelayScript, createIndex) and associated parameters for PostgreSQL table creation from infra/main.bicep and infra/modules/app/function.bicep, as this is now handled post-deployment. [1] [2] [3] [4]
• Removed the clientKey parameter and its assignment from the Function App module, as it is now set up post-deployment. [1] [2]
• Cleaned up virtual network module by removing the deployment-scripts subnet and associated outputs, which are no longer needed. [1] [2]

Minor infrastructure updates:

• Simplified tag assignment in the resource group tags module for improved readability.
• Removed an unused baseUrl variable from infra/main.bicep.

Does this introduce a breaking change?

• Yes
• No

How to Test

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cd [repo-name]
git checkout [branch-name]
npm install

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