Add e2e-cli for E2E testing

[MichaelGHSeg]

Summary

• Adds e2e-cli/ — a Ruby CLI that reads a JSON event sequence via --input, sends events through Segment::Analytics::Client, and outputs {"success": true/false, "sentBatches": N} to stdout
• Supports all six event types: track, identify, page, screen, alias, group
• Loads the SDK directly from ../lib via $LOAD_PATH — no gem install required
• Works around a bug in Transport#initialize where options[:ssl] ||= SSL silently overrides ssl: false with true; fixed by stripping :ssl before super and force-setting @http.use_ssl afterward
• Adds .github/workflows/e2e-tests.yml and publish-e2e-cli.yml
• Restricts e2e-config.json to basic test suite

Test plan

• ruby e2e-cli/main.rb --input '{"writeKey":"...","apiHost":"...","sequences":[...]}' exits 0 and prints JSON
• Basic E2E suite passes: cd sdk-e2e-tests && CLI_COMMAND="ruby .../main.rb" E2E_TEST_SUITES=basic npx vitest run
• e2e-tests.yml workflow runs clean on CI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.30%. Comparing base (167f59f) to head (f82db36).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #279   +/-   ##
=======================================
  Coverage   45.30%   45.30%           
=======================================
  Files          12       12           
  Lines         479      479           
=======================================
  Hits          217      217           
  Misses        262      262           

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