Consider consolidation of Terraform modules, templates, and deployment model with other projects

[andrebriggs]

As a: developer

I want: to have one place (preferably a new repository) to have unit tested Terraform templates for AKS (with Flux) and other Azure resources.

A consideration would be to look at the Cobalt modules and the Bedrock modules (here and here)

So that:

• I don't have to depend on multiple repositories when utilizing Terraform templates.
• It's easier for me to compose "advocated patterns"
• There is one place for CSE engineers to grab TF modules and find starter TF templates
• Developers can version their TF modules and templates

There are already some dependencies Cobalt repo has on Bedrock

• Vnet
• TF Backend

Describe the solution you'd like:

Create a high level proposal that that covers (DONE)

• Differences and commonalities between Bedrock infra and Cobalt infra deployment models
• A recommendation on what components from Bedrock infra and Cobalt infra to go forward with
  • Feedback and iterate on doc (In progress)
  • Create a new repo (TODO)

Acceptance Criteria: We have a starting point for a conversation to consolidate Terraform modules, templates and deployment patterns

Describe alternatives you've considered:

Additional context:

Does this require updates to documentation?:

[NathanielRose]

Design doc - https://github.com/NathanielRose/design-Docs/tree/master/Designs/Azure-Terraform-Catalog