add option to populate google_analytics_4_id value

[copolycube]

google_analytics_4_id isn't populated in the current j2 grafana.ini template

cf. https://grafana.com/docs/grafana/latest/setup-grafana/configure-grafana/#google_analytics_4_id
(note: other values might be needed)

[CLAassistant]

All committers have signed the CLA.

[ishanjainn]

cc @gardar

[copolycube]

A way to bypass is to manually add a task after the role to edit the file with community.general.ini_file

    - name: Grafana.ini google_analytics_4_id setup
      become: true
      community.general.ini_file: 
        path: /etc/grafana/grafana.ini 
        section: analytics 
        option: google_analytics_4_id 
        value: "{{ lookup('ansible.builtin.env', 'VAR_google_analytics_4_id') }}" 
        backup: true