Auto-add generated converters to resource converter map

[melinath]

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Description

We currently already auto-generate conversion code for a bunch of resources that then have to be hand-added to terraform-validator. Building on the work for #217, we should also auto-add those converters to the resource converter map.

Note: because we don't want to mass-add resources without tests, we would need to add exclude_validator to the existing resources in the relevant terraform.yaml files for now. We can then re-enable them one by one as we're able to write tests.

[marktru]

Internal issue: b/211888856