chore: remove redundant ansible.cfg and hide skipped ansible task output

[ma-hartma]

With the different flavors of the mini-lab we sometimes have a lot of skipped Ansible tasks, since they're optional.
These all get shown to the user, bloating the terminal output.

This setting change avoids that and only shows running tasks.

As @Gerrit91 mentioned, the ansible.cfg is redundant, as it is included in the base images.
The only overwrite was the handling of (not anymore recommended) RSA keys which I replaced with ed25519 keys.
Instead of ignoring a hyphen in the control-plane group name, it is now called control_plane.

References:

• https://docs.ansible.com/projects/ansible/latest/reference_appendices/config.html#display-skipped-hosts
• https://docs.ansible.com/projects/ansible/latest/reference_appendices/config.html#transform-invalid-group-chars

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[ma-hartma]

@Gerrit91 I removed the ansible.cfg and replaced the RSA key with a ed25519 key to avoid allowing RSA keys.
The force_valid_group_names = ignore parameter was replaced by the following: https://docs.ansible.com/projects/ansible/latest/reference_appendices/config.html#transform-invalid-group-chars in newer Ansible versions.

The problem is that hyphens in group-names are invalid and we need to decide if we:

1. Rename the control-plane group to control_plane
   OR
2. Transform invalid group chars automatically.

I'd go for (1), as it is more transparent if we want to debug.
What do you think?

[Gerrit91]

Yes, please go for option (1).

[Gerrit91]

Nice, thank you!