Revert to Unmodified pre-commit Configuration in GitHub Actions Workflow

[mcdonnnj]

🗣 Description

This PR removes the customized pre-commit configuration that was added because of issues we were having with the terraform_validate hook.

💭 Motivation and Context

This customization is no longer required because the offending hook is disabled per

skeleton-packer/.pre-commit-config.yaml

Lines 103 to 118 in a07d31c

	# There are ongoing issues with how this command works. This issue
	# documents the core issue:
	# https://github.com/hashicorp/terraform/issues/21408
	# We have seen issues primarily with proxy providers and Terraform code
	# that uses remote state. The PR
	# https://github.com/hashicorp/terraform/pull/24887
	# has been approved and is part of the 0.13 release to resolve the issue
	# with remote states.
	# The PR
	# https://github.com/hashicorp/terraform/pull/24896
	# is a proprosed fix to deal with `terraform validate` with proxy
	# providers (among other configurations).
	# We have decided to disable the terraform_validate hook until the issues
	# above have been resolved, which we hope will be with the release of
	# Terraform 0.13.
	# - id: terraform_validate

🧪 Testing

The Actions workflow completes successfully as expected.

✅ Checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All new and existing tests pass.

[hillaryj]

🏆

[jsf9k]

[dav3r]

🧹