feat(pubsub): promote BulkPublishEvent from alpha1 to stable

[madmecodes]

Summary

• Update gRPC client to call bulkPublishEvent instead of bulkPublishEventAlpha1
• Update HTTP client to use v1.0 API version instead of v1.0-alpha1 for bulk publish
• Add stable BulkPublishEvent RPC to proto definition and mark BulkPublishEventAlpha1 as deprecated, regenerating ConnectRPC stubs

Fixes #786

Test plan

• Verify build compiles successfully (npm run build)
• Run unit tests (npm test)
• Verify gRPC bulk publish uses stable BulkPublishEvent endpoint
• Verify HTTP bulk publish hits v1.0/publish/bulk/... instead of v1.0-alpha1/publish/bulk/...

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 25.95%. Comparing base (d1bf38a) to head (783c033).
⚠️ Report is 78 commits behind head on main.

Files with missing lines	Patch %	Lines
src/implementation/Client/GRPCClient/pubsub.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              main     #808       +/-   ##
============================================
- Coverage   100.00%   25.95%   -74.05%     
============================================
  Files            1      138      +137     
  Lines            6     3725     +3719     
  Branches         1      564      +563     
============================================
+ Hits             6      967      +961     
- Misses           0     2714     +2714     
- Partials         0       44       +44     

☔ 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.