Rewatch: use a single timestamp per compile pass (#8428) #10209

Job	Run time
test-devcontainer	16m 9s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin, release)	22m 11s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	9m 3s
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe, release)	18m 23s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin, release)	9m 49s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	8m 52s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	8m 58s
api-docs	2m 15s
pkg-pr-new	52s
test-installation-pnpm (macos-15)	15s
test-integration-rewatch (macos-15-intel)	7m 17s
test-installation-pnpm (ubuntu-24.04)	14s
test-installation-pnpm (windows-2025)	55s
test-installation-pnpm (ubuntu-24.04-arm)	21s
test-installation-pnpm (macos-15-intel)	54s
test-integration-rewatch (ubuntu-24.04-arm)	2m 59s
test-integration-rewatch (windows-2025)	7m 12s
test-integration-rewatch (macos-15)	5m 9s
test-installation-npm (ubuntu-24.04-arm)	17s
test-installation-npm (macos-15-intel)	22s
test-integration-rewatch (ubuntu-24.04)	3m 59s
test-installation-npm (macos-15)	16s
test-installation-npm (ubuntu-24.04)	11s
test-installation-npm (windows-2025)	45s
publish	0s
	2h 7m 38s

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