Use React.useId() instead of lodash.uniqueid

[kensnyder]

When using SSR (e.g. with Remix or Next) lodash.uniqueid will cause a hydration mismatch warning because the server will have different IDs from the client.

This PR uses React.useId() which returns a unique ID that is stable between client and server. I also omit IDs when jest is defined so that the test snapshots will match.

[corygibbons]

@kensnyder Thanks for this! I didn't even know React a function for that. My only concern is it looks like this is will only work in React 18+ (we currently support ^18.0.0 || ^17.0.0 || ^16.2.0). Still debating if it's worth just bumping the major version. 🤔

[kensnyder]

Closing in favor of #53.