invalid tf files in subfolders

[shlomimatichin]

fixes #43

[yaronya]

Looks fine n' easy, but I got some comments:

1. Should we have the folder name marked with the issue number? and not use case? 🤔
2. We probably need to have test files also for Terraform 11 + 12.
3. Looks like CI github actions did not run (?), but I think it'd fail the aws_submodule test since we wouldn't parse any of the included .tf files.
   I'd suggest to move the parent.tf file to be a main.tf file under root folder.

[roni-frantchi]

CI fixed.
@shlomimatichin you're welcome to take a look at the rest of @yaronya 's comments

[shlomimatichin]

@yaronya

1. i've put both in the name. i think it helps to be able to read why that test was originally there.
2. i don't see much value in that. repeating the test does not add coverage, it's not really about the differences between the versions, unlike other cases. at least in past projects i've reached "too much tests" position, so i'm not excited to recreate that again. at any case, if you still think this should block merging, lmk, i'll duplicate the test.