Add E2E Terraform testing to the sample

[promisinganuj]

We are using Fabric Terraform provider along with AzureAD/AzureRM providers for this sample. Now that we have the terraform based IaC deployment, we would like to add the E2E testing for Terraform. We agreed on the following approach:

• Writing E2E unit-test cases rather than at module level.
• Using "terratest" (golang). The other option we considered was the native terraform test.
• For Fabric, we would use GO SDK. Reference: https://github.com/microsoft/fabric-terraform-quickstart/blob/main/quickstarts/401-testing-terratest/workspace_test.go

This would be developed in collaboration with DevX team.

Please feel free to split this feature item into individual stories.

Child Items

• [x] #813

[hattan]

🔬 Description

When using the E2E samples, I want infrastructure tests to be available, so I can easily verify deployments.

🎯 Acceptance Criteria

• [ ] Samples should have an infrastructure/test folders.
• [ ] Tests should be written using Terratest to verify deployments.
• [ ] Dev container definitions should be updated so that testing dependencies are available immediately.
• [ ] Stretch: Module tests for individual modules should exist
• [ ] Stretch: Terratest module for Fabric can be optional.

🔦 Additional Info

• Terratest