Move `sameError` to `fs-sim-test` #260

Job	Run time
stylish-haskell (9.6.4, 3.10.3.0, ubuntu-latest)	27s
cabal-fmt (9.6.4, 3.10.3.0, ubuntu-latest)	26s
cabal-check (9.6.4, 3.10.3.0, ubuntu-latest)	27s
build (8.10.7, 3.10.3.0, ubuntu-latest)	27s
build (8.10.7, 3.10.3.0, windows-latest)	20s
build (8.10.7, 3.10.3.0, macOS-13)	25s
build (9.2.8, 3.10.3.0, ubuntu-latest)	25s
build (9.2.8, 3.10.3.0, windows-latest)	23s
build (9.2.8, 3.10.3.0, macOS-13)	25s
build (9.4.8, 3.10.3.0, ubuntu-latest)	25s
build (9.4.8, 3.10.3.0, windows-latest)	24s
build (9.4.8, 3.10.3.0, macOS-13)	26s
build (9.6.4, 3.10.3.0, ubuntu-latest)	23s
build (9.6.4, 3.10.3.0, windows-latest)	24s
build (9.6.4, 3.10.3.0, macOS-13)	26s
build (9.8.2, 3.10.3.0, ubuntu-latest)	24s
build (9.8.2, 3.10.3.0, windows-latest)	26s
build (9.8.2, 3.10.3.0, macOS-13)	25s
	7m 28s

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