Updates to reflect recent changes with the Azure AI extension and PostgreSQL extension in VS Code

[kylebunting]

Purpose

Updates the solution accelerator to:

1. Use the PostgreSQL extension for VS Code versus pgAdmin.
2. Replaces the use of azure_ml.invoke() with the new rank semantic operator in the Azure AI extension.
3. Swaps out Azure OpenAI and Language services with Azure AI Foundry (including a hub and project).
4. Updates the Bicep scripts to deploy the Azure AI Foundry account, hub, and project.
5. Adds steps to have users use Azure AI Foundry to deploy a cross-encoder model (Cohere-rerank-v3.5) and connect that to the Azure AI extension to perform semantic reranking.
6. Updates the configuration of Azure AI services in PostgreSQL to use managed identity authentication versus keys.

Does this introduce a breaking change?

[X] Yes
[ ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[X] Other... Please describe:

This PR updates the accelerator to take advantage of new features of the Azure AI extension and the PostgreSQL extension in VS Code.

How to Test

• Get the code

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

• Test the code

What to Check

Verify that the following are valid

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Other Information