Merge `rc/v0.51` to `feat/managed-decimal` #143

Job	Run time
Contracts (nightly) / Clippy linter check	1m 11s
Contracts (nightly) / Rust tests	2m 49s
Contracts (nightly) / Test Coverage	6m 9s
Contracts (nightly) / Wasm tests	9m 25s
	19m 34s

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