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Remove `opaque-debug` and `collectable` (#1452) #1167

Job	Run time
test (stable)	13s
test (1.85.0)	21s
build (stable, thumbv7em-none-eabi)	20s
build (1.85.0, wasm32-unknown-unknown)	17s
build (1.85.0, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	9s
minimal-versions / minimal-versions	23s
	2m 1s

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