Fix parallel batch item invocation in Invoke-HaloBatchProcessor

[homotechsual]

This pull request updates the Invoke-HaloBatchProcessor function to improve how batch item processing is executed in parallel and how results are returned. The main changes involve invoking batch items within the context of the HaloAPI module and returning batch results as an array.

Parallel Processing and Results Handling:

• Batch item invocation is now performed via the HaloAPI module's Invoke method, ensuring that the execution context and dependencies are correctly managed when running in parallel.
• The function now returns the batch results as an array using .ToArray(), which standardizes the output format and may improve compatibility with downstream processing.

[codecov-commenter]

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