Add initial terraform scripts for automating infra. for Informatica Secure Agent

See merge request interop/iics_secure_agent!2

Since our licensing restrict us from more than 1 instance of Secure Agent, before deploying a new instance existing instance need to be shutdown (after adjusting any resources that depends on that instance). Due to this reason terraform is not part of CI/CD.

Add gitlab-ci file

See merge request interop/iics_secure_agent!1

cleanup unused dir