fix: terragrunt validate for module folders (#191)

[mhennecke]

Only include folders with a terragrunt.hcl file (default for terragrunt validate) in the terragrunt_validate pre-commit hook

Fixes #191

[github-actions]

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[MaxymVlasov]

This PR does not provide a fix that can be accepted.

Firstly, terragrunt_validate hook run only in folders with .hcl files

pre-commit-terraform/.pre-commit-hooks.yaml

Lines 80 to 86 in ac9299c

	- id: terragrunt_validate
	name: Terragrunt validate
	description: Validates all Terragrunt configuration files.
	entry: terragrunt_validate.sh
	language: script
	files: (\.hcl)$
	exclude: \.terraform\/.*$

Secondly, folks can create many .hcl files in one dir and/or name them different than terragrunt.hcl.