Modifier `hds-register-event` - Convert to TypeScript

[didoo]

:pushpin: Summary

Converts the hds-register-event modifier to TypeScript

:link: External links

Jira ticket: https://hashicorp.atlassian.net/browse/HDS-3337

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👀 Component checklist

• [x] Percy was checked for any visual regression
• [x] A changelog entry was added via Changesets if needed (see templates here)

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