Fix the double unescape of property value

[Jackie-Jiang]

The context is in #12393
The root cause is that we did 2 unescapes when reading the property value (one implicit unescape within the getProperty()).
This PR fixes this behavior so that we can properly read old metadata files. One behavior change when upgrading from Configuration to Configuration2 is that character with surrogates are no longer supported. When surrogates are encountered, treat the value as invalid.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (43dadbf) 61.73% compared to head (fde98c9) 61.74%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
...ment/creator/impl/SegmentColumnarIndexCreator.java	60.00%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #12405   +/-   ##
=========================================
  Coverage     61.73%   61.74%           
  Complexity      207      207           
=========================================
  Files          2428     2428           
  Lines        132828   132834    +6     
  Branches      20545    20551    +6     
=========================================
+ Hits          82007    82014    +7     
+ Misses        44811    44803    -8     
- Partials       6010     6017    +7     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (ø)
integration	<0.01% <0.00%> (ø)
integration1	<0.01% <0.00%> (ø)
integration2	0.00% <0.00%> (ø)
java-11	61.67% <82.60%> (+<0.01%)	⬆️
java-21	61.62% <82.60%> (+<0.01%)	⬆️
skip-bytebuffers-false	61.70% <82.60%> (-0.01%)	⬇️
skip-bytebuffers-true	61.59% <82.60%> (+0.01%)	⬆️
temurin	61.74% <82.60%> (+<0.01%)	⬆️
unittests	61.73% <82.60%> (+<0.01%)	⬆️
unittests1	46.92% <56.52%> (+<0.01%)	⬆️
unittests2	27.72% <26.08%> (+<0.01%)	⬆️

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