Bring Umami Example Up To Date

[backlineint]

This pull request is for: (mark with an "x")

• [x ] examples/umami
• [ ] modules/next
• [ ] packages/next-drupal
• [ ] starters/basic-starter
• [ ] starters/graphql-starter
• [ ] starters/pages-starter
• [ ] Other

Describe your changes

As of the 2.x release the Umami example in the monorepo won't run. This initial draft PR addresses a few things (link codemod, an import that needed to be updated) but there is more that needs to be updated, possibly including:

• Updating to Next 15
• Ensuring that builds run (looks like there is a type error).
• Ensuring that auth example works.
• Ensuring that create resource example works.

We should also update this example to use the app router at some point, but that seems like it should be a follow up.