refactor: ManagedResultArgLoader replaced with ManagedVec iterators #7517

Job	Run time
cargo fmt	17s
Contracts / Interactor tests	11m 52s
Contracts / Wasm tests	11m 29s
Contracts / Clippy linter check	1m 37s
Contracts / Rust tests	4m 12s
Contracts / Test Coverage	7m 42s
	37m 9s

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