feature: skip alertmanager service installation

[tvenieris]

[tvenieris]

The restart handler is not affected by this new variable, because an "alertmanager" service is created by another role that handles the container lifecycle, and we still want the restart to happen when there is a configuration change.

[codecov-commenter]

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[gardar]

Obsoleted by #425

Please use --skip-tags install or --skip-tags <role name>_install to skip install

[github-actions[bot]]

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