fix: Skip terragrunt_validate for directories without terragrunt.hcl

[AruneshDwivedi]

When terragrunt_validate runs against a directory containing only .hcl files but no terragrunt.hcl, it fails with a misleading error since terragrunt validate requires that file. This happened in multi-tier setups where base.hcl or tier.hcl files live alongside module directories. Added a check to skip directories without terragrunt.hcl.

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Terragrunt validation now runs only in directories containing a terragrunt.hcl file.
  • Directories without Terragrunt configuration are skipped, avoiding unnecessary validation errors.

Walkthrough

Changes

Terragrunt validation

Layer / File(s)	Summary
Directory validation guard hooks/terragrunt_validate.sh	per_dir_hook_unique_part skips directories without terragrunt.hcl and continues to run the configured Terragrunt validation command when the file exists.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: antonbabenko

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: skipping validation for directories without terragrunt.hcl.
Description check	✅ Passed	The description directly explains the validation error and the change that skips directories without terragrunt.hcl.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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