[devex] Improve data gathering per stage

[bharathkkb]

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At each stage, we ask the user to populate terraform.tfvars with values from previous stages or static data like billing_account. This seems like repeated data gathering and we should provide an alternative to automate/script some of this.

[morgante]

I have a module-based approach for dealing with this, will share an example PR.

[github-actions[bot]]

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[bharathkkb]

fixed by https://github.com/terraform-google-modules/terraform-example-foundation/pull/782. We still have a few places to fully make use of this but will track those separately.