Detect `unused-asyncio-dangling-task` (`RUF006`) on unused assignments #22504

Job	Run time
python package	1m 18s
mkdocs	1m 50s
Determine changes	14s
cargo fmt	14s
pre-commit	42s
cargo test (windows)	4m 34s
cargo test (linux)	3m 51s
cargo clippy	1m 45s
cargo fuzz	4m 7s
cargo test (wasm)	1m 14s
cargo udeps	1m 46s
test scripts	48s
benchmarks	9m 53s
formatter instabilities and black similarity	0s
ecosystem	7m 47s
test ruff-lsp	38s
	40m 41s

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