chore: fix ansible-lint 6.17.2

[juju4]

Description

fix most ansible-lint (full for server part, client part ongoing)

• fqcn
• tasks' names
• key order
• move playbooks/* to tasks/* else ansible-lint considers them as playbooks which they are not
• update .ansible-lint
• add ansible-galaxy requirements.yml for required collections (+main workflows)

Future work:

• It seems that gcp_compute_location_info module has been deprecated without any replacement to gather gcp regions.
• The regexp to validate ansible version does not work if similar matching pattern in requirements.txt aka including ansible-lint.

Motivation and Context

Ensure support with latest ansible and maintainable.

How Has This Been Tested?

Tested in CI and Digital Ocean (default settings or nearly)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• [] My change requires a change to the documentation.
• [] I have updated the documentation accordingly.
• [] I have added tests to cover my changes.
• All new and existing tests passed.

[CLAassistant]

All committers have signed the CLA.