Integrate JavaScript driver examples into CI build

[kirill-stepanishin]

Summary

Integrates JavaScript Gremlin examples (node) into CI to ensure they remain functional in future releases. Examples now execute automatically after integration tests and fail the build if broken.

Changes Made

• Added example execution to gremlin-js-integration-tests container in docker-compose.yml
• Made server URLs and vertex labels configurable via environment variables (replaces hardcoded localhost:8182)
• Added environment detection for traversal source - uses gmodern in CI, default connection locally
• Use specialized labels to isolate test data with consistent vertex labeling

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 76.46%. Comparing base (9b46b67) to head (0ee7bfd). :warning: Report is 399 commits behind head on 3.7-dev.

Additional details and impacted files

@@              Coverage Diff              @@
##             3.7-dev    #3240      +/-   ##
=============================================
+ Coverage      76.14%   76.46%   +0.31%     
- Complexity     13152    13308     +156     
=============================================
  Files           1084     1092       +8     
  Lines          65160    67041    +1881     
  Branches        7285     7378      +93     
=============================================
+ Hits           49616    51262    +1646     
- Misses         12839    13039     +200     
- Partials        2705     2740      +35     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

:rocket: New features to boost your workflow:

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

[andreachild]

VOTE +1

[xiazcy]

VOTE +1

[Cole-Greer]

VOTE +1