Delete DuplicateAttributeCheck #272

Job	Run time
Run all tests (dmd-latest, dmd, ubuntu-22.04, make)	29m 12s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, min libdparse)	1m 36s
Run all tests (dmd-latest, dmd, macos-latest, make)	8m 47s
Run all tests (dmd-latest, dmd, macos-latest, dub, min libdparse)	2m 52s
Run all tests (dmd-latest, dmd, windows-latest, make)	4m 0s
Run all tests (dmd-latest, dmd, windows-latest, dub, min libdparse)	3m 18s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, make)	45m 32s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, min libdparse)	2m 3s
Run all tests (ldc-latest, ldmd2, macos-latest, make)	7m 42s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, min libdparse)	4m 32s
Run all tests (ldc-latest, ldmd2, windows-latest, make)	8m 7s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, min libdparse)	3m 36s
Run all tests (dmd-latest, gdc-12, ubuntu-22.04, make)	2m 16s
	2h 3m 33s

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