Rewatch: restore backward compatibility for bsconfig.json (#8368) #9991

Job	Run time
test-devcontainer	18m 15s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	7m 30s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin, release)	9m 27s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin, release)	15m 37s
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe, release)	16m 11s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	7m 32s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	7m 53s
api-docs	2m 36s
pkg-pr-new	50s
test-integration-rewatch (windows-2025)	7m 22s
test-installation-pnpm (windows-2025)	1m 25s
test-integration-rewatch (macos-15)	4m 24s
test-integration-rewatch (ubuntu-24.04)	4m 0s
test-installation-pnpm (ubuntu-24.04)	17s
test-installation-npm (ubuntu-24.04-arm)	18s
test-installation-pnpm (ubuntu-24.04-arm)	20s
test-installation-npm (windows-2025)	1m 40s
test-installation-pnpm (macos-15)	18s
test-integration-rewatch (macos-15-intel)	8m 51s
test-installation-npm (macos-15-intel)	36s
test-installation-npm (macos-15)	19s
test-installation-npm (ubuntu-24.04)	17s
test-installation-pnpm (macos-15-intel)	46s
test-integration-rewatch (ubuntu-24.04-arm)	3m 7s
publish	0s
	1h 59m 51s

Provide feedback