Use cached session index to obtain executor params (#1190)

* Import changes from archieved repo

* Revert erroneous changes

* Fix more tests

* Resolve discussions

* Fix MORE tests

* approval-voting: launch_approval better interface (#1355)

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Co-authored-by: Javier Viola <javier@parity.io>
Co-authored-by: ordian <noreply@reusable.software>
Co-authored-by: ordian <write@reusable.software>