[Issue] host: aks fails on postprovision hook if iac doesn't include aks

[jongio]

I have a two phase provision:

phase 1

1. provision openai
2. run the app locally

phase 2:

1. provision the rest of the services, including aks

when host is aks, azd will do an auto-post-provision hook to do aks deployments or config.

Since phase 1 doesn't have aks provisioned, then this will fail with:

ERROR: deployment failed: failed invoking event handlers for 'postprovision', failed retrieving cluster admin credentials. Ensure your cluster has been configured to support admin credentials, parameter resourceName cannot be empty

I would like the post-provision hook to fail gracefully if the aks resources don't exist.

[rajeshkamal5050]

@wbreza can you take a look? Is this related some of the asks we had around provisioning with specific bicep files/resources or a service-level provisioning?

[wbreza]

This partially aligns with some of the proposed for the new AI/ML apps support in azd.

Move target resource discovery to service targets

• Right now target resource discovery occurs globally within azd. Some service targets support delayed provisioning and we currently have a less than ideal implementation.
• Moving to target resource discovery to each service target will give additional flexibility for resource discovery and offer an improve implementation.
• After this work is done we can also introduce standardized warnings/errors where a missing resource can be bubbled up correctly to the UX noting the deployment is skipped due to missing resource but continue with remaining services without throwing a fatal error.