Update formatName and abbreviateName to return a string or undefined

[trishrempel]

Description

This PR updates the formatName (and through dependency abbreviateName) to return string | undefined rather than a blank string if any of the provided inputs do not yield a valid non-empty value.

Already merged in https://github.com/Shopify/quilt-internal/pull/31

[shopify-shipitnext]

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[trishrempel]

/snapit

[github-actions]

🫰✨ Thanks @trishrempel! Your snapshots have been published to npm.

Test the snapshots by updating your package.json with the newly published versions:

"@shopify/name": "0.0.0-snapshot-20250108144406",
"@shopify/react-i18n": "0.0.0-snapshot-20250108144406",
"@shopify/react-i18n-universal-provider": "0.0.0-snapshot-20250108144406"

[trishrempel]

/snapit

[github-actions]

🫰✨ Thanks @trishrempel! Your snapshots have been published to npm.

Test the snapshots by updating your package.json with the newly published versions:

"@shopify/name": "0.0.0-snapshot-20250108150133",
"@shopify/react-i18n": "0.0.0-snapshot-20250108150133",
"@shopify/react-i18n-universal-provider": "0.0.0-snapshot-20250108150133"

[jesstelford]

LGTM 🚀