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

• Investigate TF linting and testing #813