Use of Azure Verified Modules

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### This issue is for a: (mark with an `x`)
```
- [ ] bug report -> please search issues before submitting
- [x] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
> n/a

### Any log messages given by the failure
> n/a

### Expected/desired behavior
> use of Azure Verified Modules in the Terraform IaC

### OS and Version?
> n/a

### Versions
> n/a

### Mention any other details that might be useful

I would have expected the Terraform code here to utilize the Azure Verified Modules to help wth alignment to CAF, consistency with other microsoft initiatives etc. Was there any reason these were not adopted, and if not, can we expect these to be referenced in future?

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