OAK-12298: SystemPropertySupplier: allow to signal that property is not present (implies default value)

[reschke]

I'm starting to think that the API change is too large, will try to figure out something simpler.

[github-actions]

Commit-Check ❌

Commit rejected by Commit-Check.                                  
                                                                  
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Commit rejected.                                                  
                                                                  
Type subject_max_length check failed ==> OAK-12298: SystemPropertySupplier: allow to signal that property is not present (implies default value) - fix class assignable checks 
Subject must be at most 120 characters
Suggest: Keep the subject concise (<= configured max)

[sonarqubecloud]

Quality Gate failed

Failed conditions
79.4% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud