Use Depot 8-core runner for ecosystem tests (#14463) #35982

Job	Run time
mkdocs	2m 53s
cargo fmt	17s
Determine changes	12s
pre-commit	41s
python package	1m 22s
cargo build (msrv)	3m 54s
benchmarks	4m 51s
cargo build (release)	5m 7s
cargo clippy	1m 59s
cargo fuzz	5m 13s
cargo shear	23s
cargo test (linux)	4m 10s
cargo test (wasm)	1m 40s
cargo test (windows)	11m 2s
formatter instabilities and black similarity	4m 4s
test scripts	1m 0s
Fuzz the parser	6m 48s
test ruff-lsp	38s
ecosystem	0s
	56m 14s

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