Remove chain-specific dependencies from crates that will be used in Cumulus (#1783)

* leave-modules.sh

* remove bp-rialto dependency from bp-relayers

* update leave-modules.sh

* fix Cargo.toml of pallet-bridge-relayers

* update leave-modules.sh

* remove bp-rialto and millau-runtime frombridge-runtime-common Cargo.toml

* update leave-modules.sh

* remove chain dependencies from bridge-runtime-common crate

* fix tests

* cleanup script

* rename script

* kind of success message

* remove leave-modules.sh

* use TargetHeaderChainAdapter and SourceHeaderChainAdapter in our testnets

* update script