The console actor sends `Eval` via debugger.js, not `EvaluateJS`.
Workers only handled `EvaluateJS` which was never sent. We would want to
use `Eval` for workers as well. The worker evaluation was already
non-functional.
One more motivation behind not keeping this legacy path is because it
requires passing `None` for all new fields added to
`EvaluateJSReplyValue`, that is extra burden.
Testing: All existing tests are passing.
Signed-off-by: atbrakhi <atbrakhi@igalia.com>