fix(host): cancel_task should also remove pending task #744

Job	Run time
Test raiko-lib	1m 21s
build-test-risc0 / Build and test risc0 / Build and test	8m 1s
build-test-risc0 / Run integration tests on risc0 / Build and run integration	7m 38s
build-test-native / Build and test native / Build and test	1m 54s
build-test-native / Run integration tests on native / Build and run integration	2m 6s
build-test-sgx-all / Build and test sgx / Build and test	2m 45s
build-test-sgx-all / Build and test sgx with Docker / Build and test sgx with Docker	2m 37s
build-test-sgx-all / Build and test sgx in hardware / Build and test sgx in hardware	6m 37s
build-test-sgx-all / Run integration tests on sgx / Build and run integration	2m 48s
build-test-sp1 / Build and test sp1 / Build and test	4m 27s
build-test-sp1 / Run integration tests on sp1 / Build and run integration	3m 5s
	43m 19s

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