dev: enable noUncheckedIndexedAccess and remediate exposed issues

[justlevine]

What

This PR enables noUncheckedIndexedAccess and attempts to remediate the exposed smells

Why

Related Issue(s):

Part of https://github.com/rtCamp/headless/issues/317

How

See the commit history. Each remediation occurs in its own commit.

Testing Instructions

Screenshots

Additional Info

Checklist

• I have read the Contribution Guidelines.
• My code is tested to the best of my abilities.
• My code passes all lints (ESLint, tsc, prettier etc.).
• My code has detailed inline documentation.
• I have added unit tests to verify the code works as intended.
• I have updated the project documentation as needed.
• I have added a changeset for this PR using npm run changeset.

[changeset-bot]

⚠️ No Changeset found

Latest commit: aeebfed

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[justlevine]

Would appreciate confirmation that I'm handling these type changes correctly 🙇