Expand description
Since the parachains-common package is now published to crates.io, SP runtimes for testnets will be adapted to use this package, and their config removed from the published common package. Only the configs specific to rococo, westend and wococo will be moved here, and the truly common logic will still be sourced from the parachains-common package.
In practice this just means that instead of using e.g. [parachains_common::westend::*], now
the westend configs will be in [testnets_common::westend::*].
TODO: edit all runtimes to remove the testnet configs as part of PR #1737 https://github.com/paritytech/polkadot-sdk/pull/1737