Bug: Wrapper does not forward the exit code correctly

In https://github.com/hashicorp/setup-terraform/blob/3301b9a8289a6e067869d604f5254ccce035a9d4/wrapper/terraform.js#L44-L47 a non-zero exit code is considered a failure. However, if you use `terraform plan -detailed-exitcode` you might be interested in exit code 2. But, since the wrapper just uses `setFailed()` the wrapper exits with 1.

### Steps to reproduce

Have a terraform configuration where you have changes to the terraform state.

Add a github actions step with following configuration

shell: bash {0}
run: |
terraform plan -detailed-exitcode
echo $?

### Expected result

Echo prints `2` to the log.

### Actual result

Echo prints `1` to the log.

### Workaround

Instead of using `bash` to read the exit code, create another step where you check `${{ steps..outputs.exitcode }}`.