Upgrade Next to v15

[nevendyulgerov]

📄 Context

Next.js v15 has been released some time ago so let's test it and upgrade to it.

Please note that there are some breaking changes that will affect the app once we upgrade to v15. For example params in server components and generateMetadata are now async, while before they were not. So we'll need to handle getting those params using async/await.

📈 Subtasks

• Upgrade to v15.
• Fix all areas with breaking changes.
• Generate a cartesi/rollups-explorer:devel image and use it with your cartesi-cli to check if all available functionalities/pages are working as expected

Definition of done:

• The app is working as before.
• Unit and e2e tests are passing as before.

[brunomenezes]

@nevendyulgerov, please also account for the docker images that are generated and if they are running as expected. For example, generate a cartesi/rollups-explorer:devel image and use it with your cartesi-cli to check if all available functionalities/pages are working as expected.

I think worth to add that in the subtasks as a release will kick-in an image generation to be published on docker-hub.