Simnet v8 move tests (#3647)

* Update to simnet v8

* rm duplicate

* add tags also

* revertme: add simnet image version for testing CI

* add info regarding the image names and values

* fix lint error

* one more try to fix the lint

* hardcode simnet version and revertme

* hardcode simnet

* more hardcodding

* I wonder how may silly mistakes I can make

* simnet image name needs to be hardcoded

* Update .gitlab-ci.yml

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

* Update .gitlab-ci.yml

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

* remove revertme changes

* rm unused script

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