Skip ipv6 configuration for Cloud mock service

[mansi sinha (mansisinha)]

Description

Fixed ipv6 test pipeline
arm64 test with ipv6 enabled: https://semaphore.ci.confluent.io/workflows/e070e424-2076-4400-ad85-dcd38fef322b
amd64 test with ipv6 enabled: https://semaphore.ci.confluent.io/workflows/e74bd7bc-7b8f-4d9f-92d2-f49ee0e8580f

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Checklist:

• Any variable/code changes have been validated to be backwards compatible (doesn't break upgrade)
• I have added tests that prove my fix is effective or that my feature works
• If required, I have ensured the changes can be discovered by cp-ansible discovery codebase
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[Copilot]

Pull request overview

Updates Molecule’s IPv6 preference playbook to avoid applying IPv6 configuration to the Confluent Cloud mock service host.

Changes:

• Skip the /etc/gai.conf IPv6-preference configuration task when the target host is in the ccloud_mock inventory group.

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