chore(examples): remove with-unsplash example

[JamBalaya56562]

Summary

Remove the with-unsplash example and its references from the repository

Chores:

• Delete the examples/with-unsplash directory and all associated files
• Update turbopack-dev-examples-manifest.json to remove the with-unsplash entry

Why?

unsplash-js was archived by the owner on Aug 15, 2024.

Adding or Updating Examples

• The "examples guidelines" are followed from our contributing doc https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md
• Make sure the linting passes by running pnpm build && pnpm lint. See https://github.com/vercel/next.js/blob/canary/contributing/repository/linting.md

cc: @samcx

[ijjk]

Allow CI Workflow Run

• approve CI run for commit: e29d29e

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer