Omit unrolled augmented assignments in `PIE794` #21591

Job	Run time
cargo fuzz	8m 55s
cargo fmt	15s
cargo clippy	2m 22s
cargo test (linux)	6m 31s
cargo test (wasm)	1m 3s
cargo test (windows)	8m 28s
cargo udeps	1m 48s
Determine changes	7s
test scripts	1m 6s
benchmarks	14m 16s
mkdocs	2m 11s
pre-commit	32s
python package	2m 5s
formatter instabilities and black similarity	0s
test ruff-lsp	20s
ecosystem	7m 28s
	57m 27s

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