GROOVY-11928: Make MetaClassImpl.getProperties() respect @Internal

[paulk-asert]

See also: https://groovy.apache.org/wiki/GEP-17.html

[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.46377% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.5026%. Comparing base (165bfd1) to head (b682344).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...us/groovy/transform/AbstractASTTransformation.java	73.3333%	1 Missing and 3 partials ⚠️
.../transform/EqualsAndHashCodeASTTransformation.java	42.8571%	1 Missing and 3 partials ⚠️
src/main/java/groovy/lang/MetaClassImpl.java	80.0000%	1 Missing and 2 partials ⚠️
...rg/apache/groovy/ast/tools/AnnotatedNodeUtils.java	78.5714%	1 Missing and 2 partials ⚠️
...us/groovy/transform/DelegateASTTransformation.java	66.6667%	0 Missing and 2 partials ⚠️
...aus/groovy/transform/BuilderASTTransformation.java	66.6667%	1 Missing ⚠️
...s/groovy/transform/ImmutableASTTransformation.java	0.0000%	0 Missing and 1 partial ⚠️
...y/transform/TupleConstructorASTTransformation.java	50.0000%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2467        +/-   ##
==================================================
+ Coverage     66.5002%   66.5026%   +0.0023%     
- Complexity      30418      30439        +21     
==================================================
  Files            1420       1420                
  Lines          118577     118624        +47     
  Branches        21044      21061        +17     
==================================================
+ Hits            78854      78888        +34     
- Misses          33204      33210         +6     
- Partials         6519       6526         +7     

Files with missing lines	Coverage Δ
...va/org/codehaus/groovy/reflection/CachedField.java	70.5882% <100.0000%> (+0.8913%)	⬆️
...dehaus/groovy/transform/LazyASTTransformation.java	95.3125% <100.0000%> (+0.0369%)	⬆️
...ovy/transform/MapConstructorASTTransformation.java	81.8182% <100.0000%> (ø)
...oovy/transform/ReadWriteLockASTTransformation.java	80.3571% <100.0000%> (+0.7275%)	⬆️
...us/groovy/transform/ToStringASTTransformation.java	84.5070% <100.0000%> (ø)
...aus/groovy/transform/BuilderASTTransformation.java	62.5899% <66.6667%> (ø)
...s/groovy/transform/ImmutableASTTransformation.java	66.8367% <0.0000%> (ø)
...y/transform/TupleConstructorASTTransformation.java	84.1346% <50.0000%> (ø)
...us/groovy/transform/DelegateASTTransformation.java	87.4477% <66.6667%> (+0.0527%)	⬆️
src/main/java/groovy/lang/MetaClassImpl.java	77.0039% <80.0000%> (+0.0423%)	⬆️
... and 3 more

... and 2 files with indirect coverage changes

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