feat(ConsentManager): Enable `onLoad` functionality for scripts

[nandereck]

🎟️ Asana Task 🔍 Preview Link

Description

This change enables onLoad functionality for scripts loaded via the ConsentManager component. This will allow us to register an event handler to track events for the Qualified chatbot.

Validation Steps

• [ ] Navigate to the preview
• [ ] Validate that there are no errors in the console
• [ ] Navigate to the preview of the canary release on www
• [ ] Validate that the qualified.js script loads in the DOM

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 0ea681bbab4d68fe8c8e98929108ac80428e337c

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-consent-manager | Minor |

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Name	Status	Preview	Comments	Updated (UTC)
react-components	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 11, 2023 9:07pm

[github-actions[bot]]

:package: Canary Packages Published

Latest commit: 0ea681bbab4d68fe8c8e98929108ac80428e337c

Published 1 packages

#### @hashicorp/react-consent-manager@9.2.0-canary-20230711210816 ``` npm install @hashicorp/react-consent-manager@canary ```