Backport Master CI PRs to Beta (#7890)

* Resolve conflicts

* Resolve conflicts

* Update gitlab-build.sh (#7855)

fix build ```version``` after https://github.com/paritytech/parity/pull/7723

* Resolve conflicts

* Update gitlab-test.sh (#7883)

* Update gitlab-test.sh

https://github.com/paritytech/parity/issues/7871

* Update aura-test.sh

* Backport master ci prs

* Bump beta to 1.9.3

* Make track beta

* Downgrade rustc_version