ci: Run SDK browser smoke tests as a separate workflow job

[mondoreale]

Summary

Separates SDK browser smoke tests from the main browser end-to-end test job into its own dedicated workflow job for better CI visibility and parallel execution.

Changes

• Extracted npm run test-browser-smoke from existing browser test job
• Created new sdk-browser-smoke-test job with required Docker services and test environment configuration – this includes cassandra now for the resend testing.

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Note

Separates SDK browser smoke tests from the main browser E2E job and updates test credentials.

• Adds sdk-browser-smoke-test job in .github/workflows/validate.yml with browser setup, required Docker services (including cassandra), and runs npm run test-browser-smoke
• Removes inline npm run test-browser-smoke execution from sdk-browser-e2e job
• Updates packages/sdk/test/browser-smoke-test/smoke-test.html to use a new PUBLISHER_KEY value

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