Turn on typechecking for text component template in showcase

[natmegs]

📌 Summary

Example of how we can use showcase to check types as a consumer for HDS components. This PR opts into template typechecking for the Text component, and similar opt in could be done for showcase templates displaying any typed HDS components.

2 issues preventing this from being merged:

• Currently there are type failures in the text template since the type of this.model is void, even though route and controller are typed. I must be missing something as these docs indicate the type should be inferred based on route + controller
• Using glint-expect-error to get around the above results in CLI output saying the expect error is unnecessary, but removing it results in a legit type error

🛠️ Detailed description

📸 Screenshots

🔗 External links

Jira ticket: HDS-XXX
Figma file: [if it applies]

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👀 Component checklist

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

💬 Please consider using conventional comments when reviewing this PR.

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Name	Status	Preview	Updated (UTC)
hds-showcase	✅ Ready (Inspect)	Visit Preview	May 16, 2024 6:34pm
hds-website	✅ Ready (Inspect)	Visit Preview	May 16, 2024 6:34pm

[didoo]

@natmegs now that @aklkv PR #2109 has been merged, I think this draft PR can be closed right? (they do the same thing if I'm not wrong).