Add variable to not use Red Hat subscription

[nesies]

Code of Conduct

• I have read and agree to the project's Code of Conduct.

Description

Red Hat subscription is mandatory in kickstart and playbook.
But somebody (me) might want to not use subscription.

Use Case(s)

a Red Hat without subscription

Potential Configuration

add a variable rhsm_enabled_ in builds/rhsm.pkrvars.hcl.example
And use it in packer / playbook

• ansible/roles/base/tasks/redhat.yml
• builds/linux/rhel/8/data/ks.pkrtpl.hcl
• builds/linux/rhel/8/linux-rhel.pkr.hcl
• builds/linux/rhel/8/variables.pkr.hcl
• builds/linux/rhel/9/data/ks.pkrtpl.hcl
• builds/linux/rhel/9/linux-rhel.pkr.hcl
• builds/linux/rhel/9/variables.pkr.hcl
• builds/rhsm.pkrvars.hcl.example

References

No response

[tenthirtyam]

I'm please feel free to open a pull request for this enhancement. We will review and merge after the CLA is approved and all tests pass.