Public bug reported:

[Impact] 
* People start experiencing /boot and disk near being full due to our snapshot 
policy.
* Until we implement GC pressure based on disk space, mitigate the issue by 
only keeping last month.


[Test Case]
* Install new ZSys version
* zsysctl show
-> You should see history states that are older than one month
* Wait for a GC pass to be ran, or run directly zsysctl service gc
-> The history states older than a month should be gone (for states that don’t 
have dependencies)

[Regression Potential] 
This change is a configuration tweak, which is already covered by a great 
number of test cases. Manual testing has been done on a system with a bunch of 
history states.

The regression would be too much or too few history states being
removed, but as said, this scenario is already covered by other test
cases.

** Affects: zsys (Ubuntu)
     Importance: High
         Status: New

** Affects: zsys (Ubuntu Focal)
     Importance: High
         Status: New

** Also affects: zsys (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: zsys (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: zsys (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1889385

Title:
  Change zsys GC to only keep one month

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