Introduce opentelemetry in rewatch and setup new test infrastructure #9523

Job	Run time
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	6m 15s
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe)	13m 4s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	14m 45s
test-devcontainer	16m 52s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	6m 16s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	6m 44s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	12m 38s
pkg-pr-new	50s
api-docs	5s
test-installation-npm (ubuntu-24.04-arm)	18s
test-integration-rewatch (macos-15)	1m 27s
test-installation-pnpm (windows-2025)	38s
test-installation-npm (macos-15-intel)	21s
test-installation-pnpm (macos-15-intel)	38s
test-integration-rewatch (macos-15-intel)	3m 35s
test-installation-pnpm (macos-15)	18s
test-integration-rewatch (ubuntu-24.04-arm)	1m 13s
test-integration-rewatch (windows-2025)	3m 19s
test-installation-npm (windows-2025)	40s
test-integration-rewatch (ubuntu-24.04)	1m 28s
test-installation-pnpm (ubuntu-24.04)	11s
test-installation-npm (ubuntu-24.04)	12s
test-installation-pnpm (ubuntu-24.04-arm)	14s
test-installation-npm (macos-15)	17s
publish	-1s
	1h 32m 17s

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