Fix disabled ToggleSwitch behavior

[camertron]

Description

We received a bug report via Slack today showing that disabled ToggleSwitches can still be toggled. We have tests to verify this behavior that are currently passing erroneously. This PR accomplishes the following:

1. Fixes the tests in question.
2. Disallows toggling disabled ToggleSwitches.
3. Fixes a bug causing the wrong on/off state to be submitted on toggle. The form should send a 0 if the switch is being toggled from on -> off, and a 1 if it's being toggled from off -> on.

Integration

Does this change require any updates to code in production?

No. The ToggleSwitch component isn't being used anywhere in prod.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews

Co-authored with @neall

[changeset-bot]

🦋 Changeset detected

Latest commit: e94cc4a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Patch

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[github-actions]

⚠️ Visual differences found

Our visual comparison tests found UI differences. Please review the differences by viewing the files changed tab to ensure that the changes were intentional.

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[jonrohan]

LGTM