Rename the CI `cargo fmt` job to `formatting`. #1717

Job	Run time
cargo check (aarch64-android)	1m 30s
cargo clippy (windows-latest)	2m 15s
cargo check (msrv) (wasm32)	45s
cargo clippy (macos-latest)	1m 20s
cargo check (msrv) (windows-latest)	2m 2s
cargo clippy (ubuntu-latest)	1m 30s
cargo check (msrv) (macos-latest)	38s
cargo clippy (wasm32)	1m 29s
cargo check (msrv) (ubuntu-latest)	52s
cargo doc	1m 10s
formatting	25s
cargo test (wasm32)	33s
Prime LFS Cache	8s
typos	5s
cargo test (windows-latest)	3m 20s
cargo test (macos-latest)	1m 41s
cargo test (ubuntu-latest)	3m 46s
	23m 29s

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