fix(misconf): Handle templating better in tfjson

[simar7]

Currently we don't handle templated values correctly in terraform plan json scanning. This leads to issues like the following:

2024-03-06T12:07:28.162-0700    DEBUG   [misconf] 07:28.162601000 terraform.parser.<root>          error parsing 'main.tf': main.tf:757,29-30: Extra characters after interpolation expression; Template interpolation doesn't expect a colon at this location. Did you intend this to be a literal sequence to be processed as part of another language? If so, you can escape it by starting with "$${" instead of just "${".

Reference: https://developer.hashicorp.com/terraform/language/expressions/strings#escape-sequences-1