Add Suspended Installation Properties to GHAppInstallation

[gilday]

Description

A suspended app installation has suspended_at and suspended_by properties that were missing from the GHAppInstallation class.

https://docs.github.com/en/rest/apps/apps?apiVersion=2022-11-28#list-installations-for-the-authenticated-app

[gilday]

These properties are represented in the current test data, but they are always null. To record examples of suspended installations, it's my understanding that a test would need to suspend an installation on the hub4j-test-org, and doing so requires admin level access to the org. This sounds prohibitively difficult to contribute. Please advise if there's a good way to test these changes.

[bitwiseman]

You could manually add test datafiles or I can grant you admin access to the org, whichever you would rather do.

[gilday]

Added the tests and test files.

[bitwiseman]

I understand that adding tests for fields like these is difficult, but they need to be covered. If they aren't a future change could silent break this functionality.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.69%. Comparing base (a1499d7) to head (726ace5).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1780   +/-   ##
=========================================
  Coverage     80.69%   80.69%           
- Complexity     2330     2332    +2     
=========================================
  Files           220      220           
  Lines          7049     7051    +2     
  Branches        372      372           
=========================================
+ Hits           5688     5690    +2     
  Misses         1128     1128           
  Partials        233      233           

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