EVM/Tezlink: Revert support for Tezos bootstrap accounts

What

Revert !17647 (merged) and !17594 (merged).

A dependency was added in manifest/product_etherlink.ml to re-use encodings and code from the Tezos protocol. However, this change causes compilation issues when running the Etherlink Tezt tests outside of the CI environment.

This merge request reverts the changes that introduced this dependency to unblock local development while we investigate and address the issue.

Why

To ensure developers can run tests locally without encountering errors due to the introduced dependency.

How

By reverting the commit that introduced the problematic dependency, we restore a working state for local development. This is a temporary measure while a more robust solution is worked on.

Manual Testing

To verify the fix, run:

dune exec etherlink/tezt/tests/main.exe

After this revert, the tests should run without issue.