Fix a bug in action_failed event class get_description() function return data type

[weilai-irl]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes the bug in the action_failed event class by ensuring that get_description() returns data encoded as JSON.

• Converts the return value of get_description() to a JSON string to ensure proper data type
• Updates the function to use json_encode consistently for error data representation

[Copilot]

While wrapping $this->data['other'] with json_encode fixes the data type issue, consider adding error handling for json_encode failure cases to prevent unexpected behavior if encoding fails.

Suggested change

	return json_encode($this->data['other']);
	$json = json_encode($this->data['other']);
	if ($json === false) {
	// Log the error and return a fallback value.
	debugging('Failed to encode $this->data["other"] to JSON: ' . json_last_error_msg(), DEBUG_DEVELOPER);
	return '{"error": "Failed to encode data"}';
	}
	return $json;