Fix dependency verifier test MavenProject setup

[xiangfu0]

Summary

• replace the Mockito MavenProject mock in PinotCustomDependencyVersionRuleTest with real MavenProject fixtures
• use a lightweight real MavenSession rooted at the top-level project so the test no longer depends on Mockito inline bytecode instrumentation of Maven internals
• keep the existing rule assertions intact while modeling real root/submodule pom paths
• fix MutableColumnStatisticsTest on current master by stubbing Dictionary.getValueSize() in the mock setup
• note that the current Pinot Unit Test Set 2 failure was introduced by PR Add getValueSize() to Dictionary and ValueReader to avoid buffer allocation #18012 (fe3e5deebd), which switched MutableColumnStatistics to use Dictionary.getValueSize()

Testing

• ./mvnw spotless:apply -pl pinot-dependency-verifier
• ./mvnw checkstyle:check -pl pinot-dependency-verifier
• ./mvnw license:format -pl pinot-dependency-verifier
• ./mvnw license:check -pl pinot-dependency-verifier
• ./mvnw -pl pinot-dependency-verifier test
• ./mvnw spotless:apply -pl pinot-segment-local
• ./mvnw checkstyle:check -pl pinot-segment-local
• ./mvnw license:format -pl pinot-segment-local
• ./mvnw license:check -pl pinot-segment-local
• JAVA_HOME=$(brew --prefix openjdk@21)/libexec/openjdk.jdk/Contents/Home PATH=$(brew --prefix openjdk@21)/bin:$PATH ./mvnw -pl pinot-segment-local -am -DskipITs -DfailIfNoTests=false -Dsurefire.failIfNoSpecifiedTests=false -Dtest=MutableColumnStatisticsTest test
• JAVA_HOME=$(brew --prefix openjdk@11)/libexec/openjdk.jdk/Contents/Home PATH=$(brew --prefix openjdk@11)/bin:$PATH ./mvnw -pl pinot-segment-local -Dtest=MutableColumnStatisticsTest test -DskipITs -DskipUTs=false

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.28%. Comparing base (6c99b6b) to head (2785a1e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18016      +/-   ##
============================================
+ Coverage     55.55%   63.28%   +7.73%     
- Complexity      752     1543     +791     
============================================
  Files          2505     3200     +695     
  Lines        143118   194169   +51051     
  Branches      22967    29915    +6948     
============================================
+ Hits          79504   122889   +43385     
- Misses        56877    61625    +4748     
- Partials       6737     9655    +2918     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-11	55.48% <ø> (-0.02%)	⬇️
java-21	63.26% <ø> (+7.74%)	⬆️
temurin	63.28% <ø> (+7.73%)	⬆️
unittests	63.28% <ø> (+7.73%)	⬆️
unittests1	55.53% <ø> (-0.02%)	⬇️
unittests2	34.19% <ø> (?)

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