Remove added tunnel domains to Customer Application on process exit

[frandiox]

• Ensure we copy .shopify back to the scaffolded diff examples so that we can cleanup tunnel domains the next time we run the process.
• Ensure resources are cleaned up on process exit.
• Best effort to remove tunnel domains on process exit.

It's easier to review this PR checking commit by commit.

To 🎩 :

1. build packages
2. run skeleton with npm run dev -- --customer-account-push__unstable
3. Check that the tunnel domain is added in Admin
4. ctrl^c to exit
5. Check that the tunnel domain is removed in Admin

[github-actions]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset.
If the changes are user-facing and should cause a version bump, run npm run changeset add to track your changes and include them in the next release CHANGELOG.
If you are making simple updates to examples or documentation, you do not need to add a changeset.

[juanpprieto]

🎩 👍🏼

[shopify]

Oxygen deployed a preview of your fd-ca-tunnel-improvements branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
vite	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 10, 2024 8:06 PM
subscriptions	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 10, 2024 8:07 PM
skeleton	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 10, 2024 8:01 PM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 10, 2024 8:06 PM
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 10, 2024 8:06 PM
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 10, 2024 8:06 PM

Learn more about Hydrogen's GitHub integration.

[frandiox]

cc @michenly check this out when you're back :)