Refactor CI/CD pipeline configurations and remove unused outputs
- Removed the unused output for helm_custom_values_file_path in outputs.tf.
- Cleaned up rules in nightly.yml by removing conditions related to GC_DF_BM_ONLY.
- Updated scripts-check.yml to disable specific linting rules for Python, Markdown, and Terraform checks, enhancing maintainability and clarity.
- Updated markdown-link-check and markdownlint versions for improved functionality.