Remove old EVM import testing #4643
Description
After #4537 is merged, we can remove the old shell scripts, and TestMustNotImport from subnet-evm, and the old libevm import allowlist code in coreth, TestLibevmImportsAreAllowed
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After #4537 is merged, we can remove the old shell scripts, and TestMustNotImport from subnet-evm, and the old libevm import allowlist code in coreth, TestLibevmImportsAreAllowed