ci: move `cross-tests` action (#699) #1236

Job	Run time
set-msrv / set-msrv	6s
minimal-versions / minimal-versions	43s
build (1.85.0, wasm32-unknown-unknown)	25s
test (1.85.0)	33s
test (stable)	32s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	25s
build (1.85.0, thumbv7em-none-eabi)	23s
	3m 25s

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