[`pyupgrade`] Better messages and diagnostic range (`UP015`) #39805

Job	Run time
Determine changes	12s
cargo fmt	17s
mkdocs	2m 23s
cargo build (release)	0s
python package	1m 17s
pre-commit	3m 26s
benchmarks	5m 11s
cargo fuzz build	4m 29s
cargo build (msrv)	4m 54s
cargo clippy	1m 55s
cargo shear	28s
cargo test (linux)	2m 5s
cargo test (linux, release)	3m 58s
cargo test (wasm)	1m 33s
cargo test (windows)	4m 10s
test scripts	1m 3s
formatter instabilities and black similarity	0s
ecosystem	3m 22s
test ruff-lsp	41s
fuzz parser	0s
	41m 24s

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