1. Bind NewDeployTxBy to Executor to be able to use
(*Executor).AddSystemFee.
2. Replace pre-defined constant deployment fee by calculated one.
This change is needed to be able to properly collect coverage for
_deploy method of a contract via neotest coverage. Ref.
https://github.com/nspcc-dev/neo-go/pull/3462#pullrequestreview-2229601870.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>