[ty] handle more `enum.auto()` cases #55407

Job	Run time
cargo fmt	18s
Determine changes	17s
python package	1m 31s
mkdocs	2m 55s
pre-commit	2m 29s
cargo build (release)	0s
cargo test (linux)	4m 12s
cargo clippy	1m 52s
cargo test (linux, release)	7m 28s
cargo test (windows)	7m 45s
ty completion evaluation	1m 41s
benchmarks instrumented (ty)	9m 53s
cargo build (msrv)	2m 29s
check playground	0s
benchmarks instrumented (ruff)	0s
test scripts	57s
cargo fuzz build	3m 45s
cargo shear	25s
benchmarks walltime (medium\|multithreaded)	8m 30s
benchmarks walltime (small\|large)	8m 10s
cargo test (wasm)	3m 29s
formatter instabilities and black similarity	-1s
test ruff-lsp	43s
ecosystem	46s
Fuzz for new ty panics	17m 7s
fuzz parser	0s
	1h 26m 41s

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