Cleanup setters in IndexLoadingConfig and do not initialize IndexConfig from it

[Jackie-Jiang]

Subtask of #14106

On top of #14256

After this PR, IndexConfig is always constructed from table config and schema to ensure consistent behavior

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.04673% with 16 lines in your changes missing coverage. Please review.

Project coverage is 55.44%. Comparing base (59551e4) to head (eff6237).
Report is 1214 commits behind head on master.

Files with missing lines	Patch %	Lines
...local/segment/index/loader/IndexLoadingConfig.java	83.78%	6 Missing and 6 partials ⚠️
...ment/local/segment/index/bloom/BloomIndexType.java	87.50%	1 Missing ⚠️
...ocal/segment/index/inverted/InvertedIndexType.java	85.71%	1 Missing ⚠️
...egment/local/segment/index/json/JsonIndexType.java	87.50%	0 Missing and 1 partial ⚠️
.../segment/local/segment/index/map/MapIndexType.java	83.33%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (59551e4) and HEAD (eff6237). Click for more details.

HEAD has 21 uploads less than BASE

Flag	BASE (59551e4)	HEAD (eff6237)
integration	7	5
integration2	3	1
temurin	12	8
java-21	7	5
skip-bytebuffers-true	3	2
skip-bytebuffers-false	7	4
unittests	5	3
java-11	5	3
unittests2	3	0

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14258      +/-   ##
============================================
- Coverage     61.75%   55.44%   -6.31%     
- Complexity      207      797     +590     
============================================
  Files          2436     2074     -362     
  Lines        133233   109354   -23879     
  Branches      20636    17314    -3322     
============================================
- Hits          82274    60636   -21638     
+ Misses        44911    43887    -1024     
+ Partials       6048     4831    -1217     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (+99.99%)	⬆️
integration	100.00% <ø> (+99.99%)	⬆️
integration1	100.00% <ø> (+99.99%)	⬆️
integration2	0.00% <ø> (ø)
java-11	55.37% <85.04%> (-6.34%)	⬇️
java-21	55.29% <85.04%> (-6.34%)	⬇️
skip-bytebuffers-false	55.40% <85.04%> (-6.35%)	⬇️
skip-bytebuffers-true	55.25% <85.04%> (+27.52%)	⬆️
temurin	55.44% <85.04%> (-6.31%)	⬇️
unittests	55.44% <85.04%> (-6.31%)	⬇️
unittests1	55.44% <85.04%> (+8.55%)	⬆️
unittests2	?

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