Do not allow two different package specs with the same suffix #9406

Job	Run time
test-devcontainer	12m 20s
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe)	13m 10s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	9m 43s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	5m 43s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	6m 4s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	13m 48s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	6m 36s
pkg-pr-new	51s
api-docs	1m 29s
test-installation-pnpm (ubuntu-24.04)	12s
test-installation-pnpm (windows-2025)	40s
test-installation-pnpm (macos-15)	19s
test-integration-rewatch (ubuntu-24.04)	2m 23s
test-installation-pnpm (macos-15-intel)	32s
test-integration-rewatch (ubuntu-24.04-arm)	1m 56s
test-installation-npm (ubuntu-24.04)	14s
test-installation-npm (macos-15)	17s
test-installation-npm (windows-2025)	1m 8s
test-installation-npm (ubuntu-24.04-arm)	15s
test-integration-rewatch (windows-2025)	5m 1s
test-integration-rewatch (macos-15-intel)	4m 21s
test-installation-pnpm (ubuntu-24.04-arm)	18s
test-installation-npm (macos-15-intel)	42s
test-integration-rewatch (macos-15)	2m 56s
publish	0s
	1h 30m 58s

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