Clean up ninja leftovers #9436

Job	Run time
test-devcontainer	4m 55s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	3m 49s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	12m 57s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	6m 31s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	4m 23s
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe)	17m 39s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	4m 37s
api-docs	15s
pkg-pr-new	1m 5s
test-installation-npm (ubuntu-24.04)	13s
test-integration-rewatch (windows-2025)	6m 5s
test-installation-npm (macos-15)	19s
test-integration-rewatch (ubuntu-24.04)	2m 24s
test-installation-npm (windows-2025)	42s
test-installation-npm (macos-15-intel)	26s
test-integration-rewatch (ubuntu-24.04-arm)	2m 1s
test-installation-pnpm (ubuntu-24.04)	14s
test-installation-npm (ubuntu-24.04-arm)	28s
test-installation-pnpm (macos-15)	23s
test-integration-rewatch (macos-15-intel)	8m 10s
test-installation-pnpm (macos-15-intel)	31s
test-installation-pnpm (ubuntu-24.04-arm)	16s
test-integration-rewatch (macos-15)	3m 52s
test-installation-pnpm (windows-2025)	39s
publish	0s
	1h 22m 54s

Provide feedback