add the ability to disable the '-auto-approve' option with terraform

[mdimiceli]

With the current settings, when we run the bbl up command, it calls terraform apply -auto-approve. In some cases, knowing that we're working with other people, some applied changes may not be something we want to apply in our infrastructure. So we'd like to be able to approve changes ourselves instead of having them applied automatically.

The apply and destroy terraform commands are always used with the -auto-approve option. Before using this option, it is recommended that you make sure that nobody else can modify the infrastructure outside the Terraform workflow.

This feature adds the ability to disable automatic approval when using terraform by adding the --disable-tf-auto-approve option and the BBL_DISABLE_TF_AUTO_APPROVE environment variable.

[nader-ziada]

change makes sense, ran the tests and tried the cli and all works as expected