Add business use case: Sync SAP SuccessFactors leave to Google Calendar (wso2-integrator)

[RDPerera]

Adds a how-to guide under Guides → Business Use Cases for building a scheduled WSO2 Integrator automation that reads approved leave from SAP SuccessFactors Employee Central (Time Off connector) and creates a matching out-of-office event on Google Calendar.

Screen.Recording.2026-10-01.at.06.56.01.mov

Follows the same structure as the existing SAP B1 low-stock guide: architecture diagram, prerequisites, Visual Designer / Ballerina Code tabs, run-and-verify, what's next.

What's included

• en/docs/guides/business-use-cases/sf-ec-leave-to-google-calendar-sync.md

• 29 screenshots of the real build in WSO2 Integrator plus an architecture diagram, under en/static/img/guides/usecases/sf-ec-leave-to-google-calendar-sync/

• Sample project: Add sample project for the SAP SuccessFactors leave to Google Calendar how-to guide integration-samples#167

Port note

Port of #697 (main) / #706 (5.1.x) to wso2-integrator:

• Placed under Business Use Cases next to the SAP Business One guide, with the slug / card_* frontmatter the guides catalog needs (sidebar is autogenerated, so no sidebars.ts change)
• Links remapped to this branch's structure: deploy-and-run/..., develop-and-test/..., editor/canvases/flow-canvas/node-palette.md, editor/panels/expression-panel.md, and a single get-started/setup/setup.md prerequisite
• All images are new files in a new directory (en/static/img/guides/usecases/sf-ec-leave-to-google-calendar-sync/); nothing existing is replaced
• The prerequisites link to the SAP SuccessFactors Time Off connector setup guide, which arrives on the connectors site with Add SAP SuccessFactors Employee Central connector catalog docs (wso2-connectors) #734

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