…form_validate` hook) run when only lockfile changed (#649)

### Description of your changes

![image](https://github.com/antonbabenko/pre-commit-terraform/assets/11096782/50022937-7360-4c3b-8919-a488730c493a)

When the terraform root module contains any child module it requires `terraform init` to run to be able to successfully run the provider lock operation.

Previously, `terraform init` was in `terraform_providers_lock` hook too, but moved out to be only in `terraform_validate`, because there was little sense in trying to lock anything that was code invalid. 
If we return `terraform init` back to  `terraform_providers_lock` - major changes in providers that remove resources etc. can be successfully written to lockfile without any checks, as such checks done in `terraform_validate`

## Workaround till the release of that stuff

Add `files: (\.tf|\.tfvars|\.terraform\.lock\.hcl)$` to `terraform_validate` hook call

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Co-authored-by: George L. Yermulnik <yz@yz.kiev.ua>