Update Java GLV examples for consistency with other GLVs

[kirill-stepanishin]

Updates Java examples in gremlin-driver and gremlin-examples/java for consistency with other GLVs and to prepare examples for CI integration. There will be a follow-up PR to execute Java examples during integration tests similar to other GLVs.

Changes Made:

• 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 data

[Cole-Greer]

VOTE +1

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.52%. Comparing base (9b46b67) to head (369a4ab).
⚠️ Report is 408 commits behind head on 3.7-dev.

Additional details and impacted files

@@              Coverage Diff              @@
##             3.7-dev    #3295      +/-   ##
=============================================
- Coverage      76.14%   75.52%   -0.63%     
+ Complexity     13152    13147       -5     
=============================================
  Files           1084     1092       +8     
  Lines          65160    67101    +1941     
  Branches        7285     7389     +104     
=============================================
+ Hits           49616    50675    +1059     
- Misses         12839    13806     +967     
+ Partials        2705     2620      -85     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[xiazcy]

VOTE +1

[kenhuuu]

VOTE +1