Changes to improve deployability

[Pamela Fox (pamelafox)]

Purpose

This PR introduces various changes to improve the deployability of the repository and cleanup deleted/commented code.

Specifically:

• Removed main.bicepparam, as that's incompatible with the location Myouki (@Allowed) decorator (it wont enforce it)
• Removed ai.yaml, as that's incompatible with using "azd env set" to override values (as far as I know)
• Added more azd env variables for the AI deployments to main.parameters.json

I also changed how credentials are handled:

• The old code called DefaultAzureCredential multiple times. We should only call a credential once, and reuse that credential, as it takes time to acquire a credential.
• We should not call DefaultAzureCredential as it's too ambiguous, and we know what credentials to use instead. I replaced it where I could with a function that uses a ChainedTokenCredential of ManagedIdentityCredential and AzureDeveloperCliCredential.
• I changed the Bicep to output the AZURE_TENANT_ID and pass that into AzureDeveloperCliCredential so that you can deploy this even if you're not using your default tenant.
• Unfortunately, both Prompty and the azure-ai-evaluation SDK do not yet allow you to pass in a credential, so I couldn't fully move away from DefaultAzureCredential. I am in talks with both SDKs about allowing that, since this template is nearly unusable with the DAC usage.

Does this introduce a breaking change?

[ ] Yes ? I'm not sure if it affects workshop use?
[ ] No

Pull Request Type

What kind of change does this Pull Request introduce?

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

How to Test

• azd up
• Run the local app. Unfortunately, since I dont have 100K TPM, I couldnt get pass the researcher phase.

[Marlene (marlenezw)]

Thanks Pamela, going to test and then will merge