More Makefile fixes (test dependencies, test-rewatch) #8830

Job	Run time
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	3m 41s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	8m 52s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	4m 40s
build-compiler (windows-2022, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu)	4m 47s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	2m 54s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static, linux-x64, x86_6...	2m 51s
pkg-pr-new	1m 0s
api-docs	7s
test-installation-pnpm (macos-15-intel)	29s
test-installation-pnpm (ubuntu-24.04-arm)	1m 19s
test-installation-pnpm (macos-15)	20s
test-installation-pnpm (windows-2022)	28s
test-installation-npm (macos-15-intel)	24s
test-installation-pnpm (ubuntu-24.04)	20s
test-integration-rewatch (macos-15)	1m 21s
test-installation-npm (windows-2022)	45s
test-integration-rewatch (ubuntu-24.04-arm)	1m 13s
test-integration-rewatch (ubuntu-24.04)	1m 23s
test-integration-rewatch (macos-15-intel)	3m 42s
test-integration-rewatch (windows-2022)	3m 12s
test-installation-npm (ubuntu-24.04)	20s
test-installation-npm (ubuntu-24.04-arm)	24s
test-installation-npm (macos-15)	14s
publish	0s
	44m 46s

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