Etherlink/Kernel/Storage: Stop forcing the kernel in etherlink mode and rely on the durable storage

Previous MR

!17159 (merged)

Next MR

!17298 (merged)

What

For now, the kernel was forced to be in Ethereum mode now read the value in the durable storage to know the chain_family. The default value of the chain family is the EVM

Why

With a kernel like that, we can reach our first goal of having a end to end test of the tezlink chain

How

Manually testing the MR

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR