chore: Module terraform rework

[niallthomson]

What this PR does / why we need it:

Each lab can provide Terraform configuration to provision additional resources and customize the EKS cluster. This PR changes the way that Terraform is written so that it acts like a true module rather that copying the TF files.

The main change this involves is that the TF configurations no longer implicitly have access to the convenience local and var stuff like local.addon_context defined in base.tf. Instead each module accepts these as variables. This means that the Terraform can be properly validated by IDEs and formatting tools because each labs Terraform is a standalone TF module.

The reset-environment script has been modified to handle both the old style modules and these changes for now. The legacy code path will be removed in a future release.

Which issue(s) this PR fixes:

Fixes #

Quality checks

• My content adheres to the style guidelines
• I ran make test module="<module>" it was successful (see https://github.com/aws-samples/eks-workshop-v2/blob/main/docs/automated_tests.md)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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