upgrade simnet tests to v8 (#9573)

* upgrade simnet tests to v8

* undo change by mistake

* add suggested changes

* rm un-used script

* echo config of simnet tests

* use proper identation and rm : to fix ci-lint

* Update .gitlab-ci.yml

Co-authored-by: Denis Pisarev <denis.pisarev@parity.io>

* fix description for tets

* rm build for PRs from this branch

* dummy trigger ci

* rm content for future PR

Co-authored-by: Denis Pisarev <denis.pisarev@parity.io>