Remove `ProspectiveParachainsMode` usage in backing subsystem (#6215)
Since async backing parameters runtime api is released on all networks
the code in backing subsystem can be simplified by removing the usages
of `ProspectiveParachainsMode` and keeping only the branches of the code
under `ProspectiveParachainsMode::Enabled`.
The PR does that and reworks the tests in mod.rs to use async backing.
It's a preparation for
https://github.com/paritytech/polkadot-sdk/issues/5079
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Co-authored-by: Alin Dima <[email protected]>
Co-authored-by: command-bot <>
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