exclude single char folders from check

[apucher]

this is a half-solution to ignore single-character directories - including the "?" directory

[apucher]

@Jackie-Jiang

[codecov-io]

Codecov Report

Merging #3687 into master will increase coverage by 9.97%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3687      +/-   ##
============================================
+ Coverage     57.32%   67.29%   +9.97%     
  Complexity        4        4              
============================================
  Files          1027     1027              
  Lines         50863    50863              
  Branches       7106     7106              
============================================
+ Hits          29155    34227    +5072     
+ Misses        19557    14301    -5256     
- Partials       2151     2335     +184

Impacted Files	Coverage Δ	Complexity Δ
...lix/EmptyBrokerOnlineOfflineStateModelFactory.java	86.66% <0%> (-13.34%)	0% <0%> (ø)
...va/org/apache/pinot/common/data/TimeFieldSpec.java	91.35% <0%> (ø)	0% <0%> (ø)	⬇️
...ator/transform/function/BaseTransformFunction.java	29.95% <0%> (+0.42%)	0% <0%> (ø)	⬇️
...g/apache/pinot/common/utils/helix/HelixHelper.java	54.16% <0%> (+0.59%)	0% <0%> (ø)	⬇️
.../pinot/core/segment/index/SegmentMetadataImpl.java	82.63% <0%> (+0.69%)	0% <0%> (ø)	⬇️
...ment/creator/impl/SegmentColumnarIndexCreator.java	88.41% <0%> (+0.77%)	0% <0%> (ø)	⬇️
...r/transform/function/ValueInTransformFunction.java	39.2% <0%> (+0.8%)	0% <0%> (ø)	⬇️
...a/org/apache/pinot/common/utils/ServiceStatus.java	70.73% <0%> (+0.81%)	0% <0%> (ø)	⬇️
...e/io/writer/impl/MutableOffHeapByteArrayStore.java	86.45% <0%> (+1.04%)	0% <0%> (ø)	⬇️
...org/apache/pinot/controller/ControllerStarter.java	61.95% <0%> (+1.08%)	0% <0%> (ø)	⬇️
... and 319 more

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