[Test] Mock cookbook virtualenv for Docker tests on AL 2023.

[gmarciani]

Description of changes

Mock cookbook virtualenv for Docker tests on AL 2023.
This is required to execute system tests on Docker for AL 2023 that depend on the cookbook virtualenv, such as the CloudWatch Agent tests.

This change fixes the PR check failure on AL23 (example:

       [2025-12-12T20:22:32+00:00] FATAL: Errno::ENOENT: cloudwatch[Configure CloudWatch] (aws-parallelcluster-environment::init line 16) had an error: Errno::ENOENT: execute[cloudwatch-config-validation] (aws-parallelcluster-environment::init line 156) had an error: Errno::ENOENT: No such file or directory - /opt/parallelcluster/pyenv/versions/3.12.11/envs/cookbook_virtualenv/bin/python
>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ActionFailed
>>>>>> Message: 1 actions failed.
>>>>>>     Converge failed on instance <slurm-config-head-node-x86-64-docker-alinux-2023>.  Please see .kitchen/logs/slurm-config-head-node-x86-64-docker-alinux-2023.log for more details

NOTE The recursive-deletion-check was reporting a false positive, so it is safe to skip it. It was complaining because in the Docker mock I am creating the directory tree with option recursive true. The check complains about it because it thinks it is used for deletion, but in this case it is used for creation, which is fine.

Tests

• PR checks.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.