Fix bug in compaction props (reapply #4092)

[ctubbsii]

This fixes a bug in the compaction properties to ensure the replacement
property is always preferred over the deprecated open.max compaction
property when it is set.

Add tests for maxOpen to override open.max:

• Adds a test to ensure that setting the maxOpen option for a compaction
  service will override the deprecated open.max property if set
• Condenses helper methods in planner tests
• Uses CompactionPlannerInitParams for tests instead of custom test code
• Adds test case for default compaction service used with deprecated
  property
• Removes hardcoded maxOpen value with reference to default property
  value
• Modifies the getFullyQualifiedOption to return the correct path for
  the <service>.planner.opts. properties

This is a reapplication of #4092 after it was reverted, to use
SiteConfiguration for testing overrides rather than modifications to
ConfigurationCopy

Changes made by ctubbsii that diverge from #4092:

• Update commit log message to add detail and format it
• Omit changes to ConfigurationCopy, including changes in Update isPropertySet to check parent config #4112, which
  is now OBE, to add a parent to preserve its role as a simple "flat"
  configuration object for testing and simple operations
• Use SiteConfiguration with overrides, instead of ConfigurationCopy
  with a parent, to test override behavior for
  DefaultCompactionPlannerTest

Co-authored-by: Christopher Tubbs ctubbsii@apache.org

[ctubbsii]

@ddanielr This should be merged into 2.1 only if whoever merges it in is prepared to subsequently merge the updated 2.1 into main. This will reapply #4092, which I reverted because of the non-trivial merge conflicts trying to merge into main
from 2.1 and because of the issues with SiteConfiguration/ConfigurationCopy mentioned above (and in Slack), which I've already fixed in this PR.