docs: Add examples for scheduled handlers in Cron Triggers documentation

[thomas-desmond]

Summary

Add code sample for Worker cron triggers directly into the documentation

closes #20632

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.

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[hyperlint-ai]

PR Change Summary

Enhanced the Cron Triggers documentation by adding code examples for scheduled handlers.

• Added a code sample for Worker cron triggers directly in the documentation.
• Introduced a new file for TypeScript examples of scheduled handlers.
• Updated existing documentation to reference the new examples.

Modified Files

• src/content/docs/workers/configuration/cron-triggers.mdx
• src/content/docs/workers/examples/cron-trigger.mdx

Added Files

• src/content/partials/workers/cron-trigger-example.mdx

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[kodster28]

Howdy @thomas-desmond, actually moved these into a shared partial file and then updated it to appear in both places.

Helps us with the maintenance!

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