fix(Call To Action): Make product optional

[pbortnick]

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Description

Update the product prop in <CallToAction /> optional. Fixes type errors as seen here

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Name	Status	Preview	Updated
react-components	✅ Ready (Inspect)	Visit Preview	Nov 8, 2022 at 8:27PM (UTC)

[changeset-bot]

🦋 Changeset detected

Latest commit: 3f37337

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

This PR includes changesets to release 1 package

Name	Type
@hashicorp/react-call-to-action	Minor

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[alexcarpenter]

👍🏼