Warn when the project is stored in OneDrive

[modmuss50]

This is a large source of random errors we see in the support channels.

[Copilot]

Pull Request Overview

This PR adds a warning system to detect when a Fabric Loom project is stored in a OneDrive directory on Windows, which is known to cause performance issues and random errors.

• Introduces a new OneDrive utility class to detect OneDrive locations via environment variables
• Integrates OneDrive detection into the Loom plugin initialization

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/main/java/net/fabricmc/loom/util/OneDrive.java	New utility class that checks if a project is located in OneDrive by reading OneDrive-related environment variables and comparing paths
src/main/java/net/fabricmc/loom/LoomGradlePlugin.java	Integrates OneDrive verification into plugin initialization by calling OneDrive.verify()

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