Add JavaScript Function Chaining to quickstart table

[Copilot]

The quickstart table (Step 2) was missing JavaScript despite the Durable Task SDK for JavaScript existing with a function-chaining sample.

Changes

• README.md – Step 2 quickstart table: Added JavaScript row pointing to the existing samples/durable-task-sdks/javascript/function-chaining sample
• README.md – Choose Your Framework table: Updated Durable Task SDKs language support from .NET, Python, Java → .NET, Python, Java, JavaScript

Language	Quickstart Sample	Run Command
JavaScript	Function Chaining	cd samples/durable-task-sdks/javascript/function-chaining && npm install && node worker.mjs

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add JavaScript Function Chaining to quickstart table</issue_title>
<issue_description>There is a Durable Task SDK for Javascript now. The quickstart for function chaining should be added to the below table:

https://github.com/Azure-Samples/Durable-Task-Scheduler/?tab=readme-ov-file#step-2-pick-your-language-and-run-a-sample</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add JavaScript Function Chaining to quickstart table #156

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