4211 - fix: Setting correct exit code for hcl validate

[yhakbar]

Description

Fixes #4211.

Returns a final error for hcl validate so that it users can check the overall exit code.

This is technically a breaking change, but I would advocate that we release this as part of a minor release instead of going through a full strict control process. It should be pretty simple to address, and it's typical behavior of linting tools, etc.

TODOs

Read the Gruntwork contribution guidelines.

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

Added error for overall exit code to be non-zero if any of the files are invalid in hcl validate command.

Migration Guide

If users were previously using hcl validate expecting a zero exit code, they'll need to suppress the exit code using something like || true in their scripts. This is because the command now returns a non-zero exit code if any of the files are invalid.

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