Remove Resource and add Debug to TaskPoolOptions

[BigWingBeat]

Objective

PR #6360 changed TaskPoolOptions so it is no longer used as a Resource, but didn't remove the Resource derive.

Solution

Remove the Resource derive from TaskPoolOptions, as it is no longer needed. Also add a Debug derive, because it didn't have it before.

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Changelog

• TaskPoolOptions no longer derives Resource, and TaskPoolOptions & TaskPoolThreadAssignmentPolicy now derive Debug.

Migration Guide

If for some reason anyone is still using TaskPoolOptions as a Resource, they would now have to use a wrapper type:

#[derive(Resource)]
pub struct MyTaskPoolOptions(pub TaskPoolOptions);

[github-actions]

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