Fix ansible-lint violations and modernize Netdata ansible quck-start playbook

[guiand888]

Summary

There are several issues with the playbook at it is:

• does not follow ansible syntax best practices (linting, FQCN, etc.)
• implements "playbook" elements into tasks
• use a script and installation methods that are deprecated

This PR fixes those issues.

Most importantly, it ensure the role remains functional as my-netdata.io/kickstart.sh is deprecated.

Key Changes

Ansible-lint Compliance

• Fixed 25+ ansible-lint violations across all files
• Passes production profile with 0 failures, 0 warnings
• Uses FQCN for all modules (ansible.builtin.*)
• Proper YAML formatting and ansible best practices

Modern Installation Approach

• Replaced deprecated netdata-claim.sh script with modern kickstart.sh approach
• Integrated installation and claiming
• Intelligent reclaim logic - only uninstall if Netdata exists
• Resolves repository conflicts during reclaim scenarios

Additional Installation Options

• netdata_channel: Choose 'stable' or 'nightly' installation
• netdata_auto_updates: Control automatic updates (default: false for automation)
• Maintains backward compatibility with existing configurations (reinstall or reclaim)

Improved Structure

• Created proper playbook.yml with playbook-level elements
• Remove playbook-level elements for task files
• Added handlers for service restarts
• Fixed template variable handling

Usage

ansible-playbook -i hosts playbook.yml

Configuration Examples

# Use nightly channel with auto-updates
netdata_channel: nightly
netdata_auto_updates: true

# Reclaim existing installation
reclaim: true