bug: Invalid variables aren't filtered out

[vincenthsh]

just hit this bug (related to a feature I added):

https://github.com/chanzuckerberg/fogg/blob/b1a9415d604f8a5be7b43f96d8c8b1b65aed5084/apply/apply.go#L576-L586

if component.Variables contains non-existing module variables, they aren't filtered out - the generated module invocation is invalid.

For some weird reason, the error wasn't caught (until I upgraded TF from 1.5.4 to 1.5.7 and terraform-aws-provider from ~> 4.0 to ~> 5.0 - I don't understand how I didn't get this error earlier because nothing indicates a change in the way evaluates the terraform configurations...

│ Error: Unsupported argument
│ 
│   on main.tf line 14, in module "foo":
│   14:   invalid_var       = local.invalid_var
│ 
│ An argument named "invalid_var" is not expected here.