Write Sample Integrations for BI Documentation

[DimuthuMadushan]

Description

We need to write sample integrations that demonstrate practical, real-world use cases and are useful for users.
These samples should showcase how to use BI capabilities effectively to implement real-world integration scenarios. This will help users understand and apply BI features in their projects.

Start with following MI samples.

1. https://mi.docs.wso2.com/en/latest/learn/samples/database-polling/
2. https://mi.docs.wso2.com/en/latest/learn/samples/email-service/
3. https://mi.docs.wso2.com/en/latest/learn/samples/fetch-salesforce/
4. https://mi.docs.wso2.com/en/latest/learn/samples/header-based-routing/
5. https://mi.docs.wso2.com/en/latest/learn/samples/scatter-gather-integration-pattern/

Version

No response

[anupama-pathirage]

Moving to the docs-bi repo.