Make the `helper_modules` role a simple task file

[alxgomz]

We have introduced a while ago a playbook which can be run before running the deployment playbook, in order to check required TCP ports are available from and to the appropriate machines.
This has been implemented within a role. Which does the following:

• checks on the destination host (where the port needs to be available) that no other service is running
• starts listening on the port
• try connecting from the source to the opened port

While the logic is fine we think it doesn't make sense to use a role for that. The purpose of this ticket is to achieve:

• Removal of the role
• Move the custom listen_port module to the main playbook
• Creation a task file and call it from the prerequisite-checks.yml playbook

[alxgomz]

tracked by OPSEXP-2147