fix: use NEXT_PUBLIC_PROFILE_ROUTE in Auth0Provider

[tusharpandey13]

Duplicate of #1966, thanks @seanparmelee

📋 Changes

Similar to what's done in useUser, first check process.env.NEXT_PUBLIC_PROFILE_ROUTE and fallback to "/auth/profile" when setting the fallback data for the profile route.

📎 References

Fixes #1965

🎯 Testing

1. Configure a custom profile route via the NEXT_PUBLIC_PROFILE_ROUTE environment variable. (ex: NEXT_PUBLIC_PROFILE_ROUTE=/api/me.
2. In a server component, fetch a user and pass it to the Auth0Provider:

const session = await auth0.getSession();

...

return (
  <Auth0Provider user={session?.user}>
    {children}
  </Auth0Provider>
);

3. In a child client component, use the useUser() hook to retrieve the user and render a field, such as the sub:

const user = userUser()

...

return (
  <div>User: {user?.sub || 'undefined'}</div>
);

4. Log into your application and navigate to a page that uses the component from the previous step.
5. Confirm that the logged-in user's sub is immediately visible on the screen and that there isn't a brief period where "undefined" is first shown.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.63%. Comparing base (4cce952) to head (75b11cf).

Files with missing lines	Patch %	Lines
src/client/providers/auth0-provider.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2021   +/-   ##
=======================================
  Coverage   74.63%   74.63%           
=======================================
  Files          21       21           
  Lines        1849     1849           
  Branches      283      283           
=======================================
  Hits         1380     1380           
  Misses        462      462           
  Partials        7        7           

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