[Cleanup] Remove the old deprecated SegmentConverter

[Jackie-Jiang]

Description

All the functionality of SegmentConverter is replaced by SegmentProcessorFramework.

Release Notes

MergeSegments is no longer available in pinot-admin, use SegmentProcessorFramework instead

[codecov-commenter]

Codecov Report

Merging #7725 (c1c9a9a) into master (94a17f3) will increase coverage by 13.33%.
The diff coverage is n/a.

❗ Current head c1c9a9a differs from pull request most recent head e18e833. Consider uploading reports for the commit e18e833 to get more accurate results

@@              Coverage Diff              @@
##             master    #7725       +/-   ##
=============================================
+ Coverage     14.51%   27.85%   +13.33%     
=============================================
  Files          1536     1566       +30     
  Lines         78679    79941     +1262     
  Branches      11764    11900      +136     
=============================================
+ Hits          11422    22264    +10842     
+ Misses        66418    55662    -10756     
- Partials        839     2015     +1176     

Flag	Coverage Δ
integration2	27.85% <ø> (?)
unittests2	?

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Impacted Files	Coverage Δ
...pinot/controller/recommender/io/ConfigManager.java	0.00% <0.00%> (-100.00%)	⬇️
...troller/recommender/io/metadata/FieldMetadata.java	0.00% <0.00%> (-100.00%)	⬇️
...roller/recommender/rules/impl/BloomFilterRule.java	0.00% <0.00%> (-100.00%)	⬇️
...oller/api/resources/PinotControllerAppConfigs.java	0.00% <0.00%> (-100.00%)	⬇️
...ler/recommender/data/generator/BytesGenerator.java	0.00% <0.00%> (-100.00%)	⬇️
...er/recommender/io/metadata/SchemaWithMetaData.java	0.00% <0.00%> (-100.00%)	⬇️
...r/recommender/rules/impl/AggregateMetricsRule.java	0.00% <0.00%> (-100.00%)	⬇️
.../recommender/exceptions/InvalidInputException.java	0.00% <0.00%> (-100.00%)	⬇️
.../recommender/rules/io/configs/PartitionConfig.java	0.00% <0.00%> (-100.00%)	⬇️
.../recommender/rules/utils/PredicateParseResult.java	0.00% <0.00%> (-100.00%)	⬇️
... and 769 more

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