feat: Get Playwright tests working with AND without JavaScript enabled

We documented our findings in `NOTES.md` at:
ITenthusiasm/remix-supertokens@2726466

NOTE: Due to limitations in SvelteKit, there are some tests that
won't work. Specifically, any scenario which tests that an HTML page
is returned in response to a form submission (with `use:enhance`)
will fail. (This can happen, for example, if a user is redirected
to a login page during form submission because their session expired.)

Other frameworks like Remix do not have this problem. The Svelte
team seems to be aware of this issue, though its priority is
unknown. Track sveltejs/kit#10855 for additional details.