add workload delete test and refactor signal handling in run_wasi function #76

Job	Run time
rustfmt	4m 16s
build / build (ubuntu-latest, x86_64, spin, v2)	22m 47s
build-wasm-images / build_and_push (examples/spin-rust-hello, images/spin)	1m 37s
build / build (ubuntu-latest, aarch64, spin, v2)	23m 25s
build-wasm-images / build_and_push (examples/spin-dotnet-hello, images/spin_dotnet)	59s
build-wasm-images / build_and_push (examples/spin-inbound-redis, images/spin-inbound-redis)	1m 4s
build-wasm-images / build_and_push (examples/spin-outbound-redis, images/spin-outbound-redis)	56s
test	3m 39s
publish-node-installer-image	0s
	58m 43s

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