Fixed infer logical type name from avro union schema

[rajagopr]

Prior to this change, the logical type conversion won't work correctly if the field level schema is of union type. Example schema below that did not work previously and works with this change.

{
  "type": "record",
  "name": "Event",
  "fields": [
    "null",
    {
      "name": "amount",
      "type": [
        {
          "type": "bytes",
          "logicalType": "decimal",
          "precision": 20,
          "scale": 11
        }
      ]
    }
  ]
}

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 62.18%. Comparing base (59551e4) to head (a98fc84).
Report is 495 commits behind head on master.

Files	Patch %	Lines
.../pinot/plugin/inputformat/avro/AvroSchemaUtil.java	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13224      +/-   ##
============================================
+ Coverage     61.75%   62.18%   +0.43%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2533      +97     
  Lines        133233   138834    +5601     
  Branches      20636    21503     +867     
============================================
+ Hits          82274    86330    +4056     
- Misses        44911    46057    +1146     
- Partials       6048     6447     +399     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	62.13% <90.00%> (+0.42%)	⬆️
java-21	62.06% <90.00%> (+0.44%)	⬆️
skip-bytebuffers-false	62.17% <90.00%> (+0.42%)	⬆️
skip-bytebuffers-true	62.04% <90.00%> (+34.31%)	⬆️
temurin	62.18% <90.00%> (+0.43%)	⬆️
unittests	62.17% <90.00%> (+0.43%)	⬆️
unittests1	46.65% <0.00%> (-0.24%)	⬇️
unittests2	27.87% <90.00%> (+0.14%)	⬆️

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