Adds tests for checkbox Web Component V3

[procload]

New Behavior

Adds tests for checkbox component

[fabricteam]

🕵 fluentui-web-components-v3 No visual regressions between this PR and main

[fabricteam]

📊 Bundle size report

_{🤖 This report was generated against 8535836fcc2e41c9f4e18df3950d04f1b50d1719}

[size-auditor]

Asset size changes

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Baseline commit: 8535836fcc2e41c9f4e18df3950d04f1b50d1719 (build)

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[brianchristopherbrady]

I was looking at the FASTCheckbox docs and saw this:

* @fires change - Emits a custom change event when the checked state changes

I didn't find any custom events being fired specifically for this in the code. It seems like it might be referring to the native event from the created input in ForAssociatedCheckbox.

I'm wondering if we need to test this. Since it's not something we've custom-coded, I'm not sure if it's necessary or not. But I thought I'd throw the question out there. Thoughts?