feat(PLT-2900): migrate PR workflow to centralized reusable workflows

[skridlevsky]

• Migrate PR workflow to centralized frontend-pr-workflow.yml@v1
• Replace 3 custom parallel jobs (build-lint-test, functional, deploy_preview) with single centralized call
• Build, lint, unit tests, SonarCloud, Cypress functional, deploy preview all handled by centralized workflow
• Release and deploy-aws workflows unchanged

[pr-auditor]

✅ Security Analysis Results

Great news! No security issues found in this pull request.

Analysis Summary:

• 📁 Files reviewed: 1
• ✅ No security vulnerabilities detected

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[gitstream-cm]

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