Remove old configuration flags #9342

Job	Run time
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe)	10m 0s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	5m 15s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	6m 21s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	4m 48s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	11m 12s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	6m 13s
api-docs	1m 43s
pkg-pr-new	52s
test-installation-pnpm (windows-2025)	32s
test-installation-pnpm (macos-15-intel)	30s
test-installation-pnpm (ubuntu-24.04)	12s
test-integration-rewatch (windows-2025)	2m 52s
test-integration-rewatch (ubuntu-24.04-arm)	1m 20s
test-installation-npm (macos-15)	21s
test-installation-pnpm (ubuntu-24.04-arm)	17s
test-integration-rewatch (macos-15-intel)	2m 16s
test-installation-pnpm (macos-15)	17s
test-installation-npm (macos-15-intel)	22s
test-integration-rewatch (ubuntu-24.04)	1m 21s
test-installation-npm (ubuntu-24.04-arm)	16s
test-integration-rewatch (macos-15)	1m 23s
test-installation-npm (ubuntu-24.04)	16s
test-installation-npm (windows-2025)	1m 1s
publish	0s
	59m 40s

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