feat: rag-stack quick start variation

[imprateeksh]

Description

This PR introduces the quick start variation of Landing zone for cloud-native AI applications aka RAG Stack.

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Release notes content

• Quick start variation of Landing zone for cloud-native AI applications
• Quick provisioning of watsonx.ai resources, watsonx Assistant, watson Discovery, Databases for Elasticsearch, Container Registry and Code Engine for rapid deployment of RAG based AI application along with Object Storage and Key Protect services.

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[ocofaigh]

@imprateeksh I left some initial comments. I think we need to get the overall content reviewed because the DA is getting renamed to "Cloud-native AI" with less focus on the term "RAG".
I also think I'll create a new repo for the quickstart variation so its separate to the stack code. They can have different release cadence then since the code is not re-used across the stack and quickstart variations. We can continue with this PR until I get the new repo set up

[ocofaigh]

@imprateeksh do you want to move the code over to https://github.com/terraform-ibm-modules/terraform-ibm-cloud-native-ai ? Please bare in mind that by doing that we will currently have to duplicate the offering level content in the ibm_catalog.json until catalog give us a way to not duplicate.

[ocofaigh]

what module requires restapi?

[imprateeksh]

watsonx.ai requires restapi, if not declared, like we usually do and let the referenced module take care of it, getting the below error, hence explicitly added the provider block.

[ocofaigh]

The tests should be using the schematics test function. All DA tests should be using schematics as thats how consumer will be deploying it. It also allows us to use private endpoints,

[imprateeksh]

/run pipeline

[imprateeksh]

/run pipeline

[imprateeksh]

I am looking into the Test failure in QuickStart DA - seen due to code engine build module but other existing Tests have also failed.

[ocofaigh]

@imprateeksh No point in running the tests in this repo - your going to trigger the stack tests too. Please move to the other repo

[imprateeksh]

Closing this PR as the new repo will be used for quick start variation.