feat(exit): suspended jobs warning and sending kill signals #701

Job	Run time
Benchmarks	7m 7s
Source code checks (stable)	11s
Build (x86_64/linux)	1m 8s
Source code checks (1.75.0)	13s
Build (aarch64/macos)	1m 5s
Check for unneeded dependencies	1m 3s
Build (aarch64/linux)	1m 29s
Build (wasm32/wasi-0.1)	22s
Test (linux)	1m 32s
Build (x86_64/windows)	1m 8s
Test (macOS)	1m 24s
OS target tests (${{ matrix.description }})	0s
	16m 42s

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