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Remove `opaque-debug` and `collectable` (#1452) #1169

Job	Run time
build (stable, thumbv7em-none-eabi)	22s
build (1.85.0, thumbv7em-none-eabi)	19s
build (1.85.0, wasm32-unknown-unknown)	25s
test (stable)	20s
minimal-versions / minimal-versions	32s
build (stable, wasm32-unknown-unknown)	43s
test (1.85.0)	15s
	2m 56s

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