Add more on_no_change hooks

[ferki]

User story

As maintainer, I would like to add more on_no_change hooks to resources, so I can provide a common interface for resources which could trigger further actions based on whether they made a change or not.

Describe the solution you'd like

Some commands/resources for which we can consider adding on_no_change hooks:

• Sync
• Cron
• Host
• Pkg
• Sysctl
• Fs
• Augeas

Describe alternatives you've considered

For now, I think it's fine to add on_no_change hooks similar to the current on_change hooks. An interesting, but much more involved implementation would be to continue creating a common Resource class, which could implement it in a more generic fashion.

Additional context

This is basically a continuation of #670, after #1386 added on_no_change hooks for file commands.