refactor: ManagedResultArgLoader replaced with ManagedVec iterators #7513

Job	Run time
cargo fmt	15s
Contracts / Wasm tests	17m 19s
Contracts / Interactor tests	12m 27s
Contracts / Rust tests	4m 9s
Contracts / Test Coverage	8m 4s
Contracts / Clippy linter check	1m 28s
	43m 42s

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