ci: publish e2e-cli build as CI artifacts

[MichaelGHSeg]

Summary

• Adds a workflow that builds the e2e-cli binary (release) on merge to main
• Uploads CI artifact
• Only triggers when e2e-cli/ or Sources/ paths change
• Note: binary is macOS arm64; Linux build can be added if needed

Test plan

• Merge and confirm artifact appears at sdk-e2e-tests@cli-builds:analytics-swift/e2e-cli

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.22%. Comparing base (4d9c0df) to head (29c4bef).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #432      +/-   ##
==========================================
+ Coverage   73.14%   73.22%   +0.07%     
==========================================
  Files          54       54              
  Lines        4063     4063              
==========================================
+ Hits         2972     2975       +3     
+ Misses       1091     1088       -3     

see 2 files with indirect coverage changes

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