Fix useCopilotAction handler re-render bug

[ZebraRoy]

What does this PR do?

This PR addresses a bug where useCopilotAction handlers could trigger multiple times during re-renders. To prevent this, an executionId is now passed to the action handler, allowing for deduplication of executions.

Changes include:

• Updating FunctionCallHandlerArguments and Action.handler types to include an optional executionId in a meta object, maintaining backward compatibility.
• Propagating the executionId from the action execution message through use-chat, CopilotKitInternal (provider), and the runtime service adapter to both frontend and backend action handlers.
• Updating the useCopilotAction documentation to reflect the new handler(args, meta?) signature and the availability of meta.executionId.

Related PRs and Issues

N/A

Checklist

• I have read the Contribution Guide
• If the PR changes or adds functionality, I have updated the relevant documentation

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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