Integrate Java Examples into CI

[kirill-stepanishin]

Integrates Java driver examples into CI to ensure they remain functional in future releases. Examples execute automatically in CI after driver integration tests and fail the build if broken.

Changes Made

CI Integration:

• Added example execution steps to gremlin-driver CI job in build-test.yml
• Examples run as scripts after driver integration tests complete
• Utilizes cached gremlin-server docker image with modern graph configuration

Example Updates:

• Changed examples from embedded graphs to remote connections for consistency with other GLVs
• Made server URLs and ports configurable via environment variables
• Added configurable vertex labels to isolate test data

Build Integration:

• Integrated examples into gremlin-driver Maven build
• Removed standalone examples/pom.xml and compiler exclusion
• Added Maven Shade plugin execution to create gremlin-driver-examples-shaded.jar
• Examples now compile and package automatically with driver build

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.51%. Comparing base (9b46b67) to head (aaed0f5).
⚠️ Report is 408 commits behind head on 3.7-dev.

Additional details and impacted files

@@              Coverage Diff              @@
##             3.7-dev    #3294      +/-   ##
=============================================
- Coverage      76.14%   75.51%   -0.63%     
+ Complexity     13152    13147       -5     
=============================================
  Files           1084     1092       +8     
  Lines          65160    67101    +1941     
  Branches        7285     7389     +104     
=============================================
+ Hits           49616    50673    +1057     
- Misses         12839    13807     +968     
+ Partials        2705     2621      -84     

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