Rewatch: warnings for unsupported/unknown rescript.json fields #8973

Job	Run time
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	6m 59s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	11m 18s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static, linux-x64, x86_6...	4m 59s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	4m 55s
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe)	10m 18s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	5m 56s
pkg-pr-new	56s
api-docs	1m 38s
test-installation-pnpm (macos-15)	17s
test-installation-pnpm (macos-15-intel)	29s
test-installation-pnpm (windows-2025)	30s
test-installation-npm (macos-15)	17s
test-installation-npm (macos-15-intel)	37s
test-installation-pnpm (ubuntu-24.04-arm)	15s
test-installation-pnpm (ubuntu-24.04)	12s
test-installation-npm (ubuntu-24.04-arm)	19s
test-installation-npm (ubuntu-24.04)	14s
test-integration-rewatch (macos-15)	1m 26s
test-installation-npm (windows-2025)	1m 22s
test-integration-rewatch (macos-15-intel)	2m 57s
test-integration-rewatch (windows-2025)	2m 56s
test-integration-rewatch (ubuntu-24.04)	1m 17s
test-integration-rewatch (ubuntu-24.04-arm)	1m 9s
publish	0s
	1h 1m 16s

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