Rust

Add `opacity` and `multiply_opacity` functions to `Ui` and `Painter` #11455

Job	Run time
Check wasm32 + wasm-bindgen	2m 22s
Format + check + test	5m 46s
android	26s
cargo-deny aarch64-apple-darwin	39s
cargo-deny aarch64-linux-android	43s
Check Windows	2m 39s
cargo-deny i686-pc-windows-gnu	39s
cargo-deny i686-pc-windows-msvc	42s
cargo-deny i686-unknown-linux-gnu	38s
cargo-deny wasm32-unknown-unknown	40s
cargo-deny x86_64-apple-darwin	39s
cargo-deny x86_64-pc-windows-gnu	42s
cargo-deny x86_64-pc-windows-msvc	39s
cargo-deny x86_64-unknown-linux-gnu	37s
cargo-deny x86_64-unknown-linux-musl	41s
cargo-deny x86_64-unknown-redox	39s
	19m 11s

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