Refactor: use `if let` instead of `for` on `Option`s (#4934) #12414

Job	Run time
Check wasm32 + wasm-bindgen	2m 31s
Format + check + test	4m 59s
android	27s
cargo-deny aarch64-apple-darwin	38s
ios	19s
Check Windows	1m 36s
cargo-deny aarch64-linux-android	39s
cargo-deny i686-pc-windows-gnu	39s
cargo-deny i686-pc-windows-msvc	35s
cargo-deny i686-unknown-linux-gnu	36s
cargo-deny wasm32-unknown-unknown	38s
cargo-deny x86_64-apple-darwin	37s
cargo-deny x86_64-pc-windows-gnu	39s
cargo-deny x86_64-pc-windows-msvc	38s
cargo-deny x86_64-unknown-linux-gnu	39s
cargo-deny x86_64-unknown-linux-musl	37s
cargo-deny x86_64-unknown-redox	41s
	17m 28s

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