Merge `rc/v0.51` to `feat/managed-decimal` #142

Job	Run time
Contracts (nightly) / Clippy linter check	1m 13s
Contracts (nightly) / Rust tests	3m 4s
Contracts (nightly) / Test Coverage	7m 17s
Contracts (nightly) / Wasm tests	10m 10s
	21m 44s

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