Remove `build` from the default exclusion list #25136

Job	Run time
mkdocs	2m 26s
cargo fmt	14s
pre-commit	48s
Determine changes	24s
python package	1m 16s
cargo fuzz	5m 9s
cargo test (linux)	4m 2s
cargo clippy	1m 49s
benchmarks	4m 29s
cargo test (wasm)	1m 10s
cargo udeps	1m 59s
cargo test (windows)	6m 33s
formatter instabilities and black similarity	0s
test scripts	49s
test ruff-lsp	17s
ecosystem	8m 9s
	39m 34s

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