Remove `opaque-debug` and `collectable` #120

Job	Run time
test-override-32-on-64	25s
test-wasm (stable)	16s
test-cross (armv7-unknown-linux-gnueabi)	1m 2s
test-wasm (1.85)	20s
test (aarch64-unknown-linux-gnu, 1.85.0, ubuntu-24.04-arm)	14s
test (aarch64-unknown-linux-gnu, stable, ubuntu-24.04-arm)	13s
test (aarch64-apple-darwin, stable, macos-latest)	22s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	32s
test (aarch64-apple-darwin, 1.85.0, macos-latest)	21s
test-cross (powerpc-unknown-linux-gnu)	1m 32s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	16s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	41s
	6m 14s

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