Skip create step when created == true

[mluzarreta]

Fixes: #4037

[DrPsychick]

This introduced a breaking change to my use case, unfortunately : https://github.com/ansible/molecule/pull/3949/files

I use libvirt to create VMs to run tests on and since creating VMs is slow, I run converge while I develop the role (VM OS is different than my machine's OS, so I need to develop with molecule/libvirt essentially).
Since the change above, converge always runs create and tries to recreate the VMs I already have, although created: true is in the state file.

Please consider this PR to revert that change (and skip create when already created).

[yanghua-ola]

Same issue here. I have a molecule scenario executed with Podman. The base image doesn't not come with Python; therefore, I install it in prepare.yml. The first molecule converge worked as expected. However, during subsequent invocations, the create step would execute again but not prepare, resulting a brand-new container without Python. As a result, molecule failed. This defect was introduced by #3949 and affects version 6.x.

[Adrixop95]

Hey, when can we expect a new version of molecule to be released on pipy with this fix?