Run kernel and user tests separately and concurrently #3493

Job	Run time
Verify C code style	7s
Verify Python code style	5s
Build Mimiker (mips-kasan)	1m 11s
Build Mimiker (mips-kcsan)	1m 10s
Build Mimiker (aarch64-kasan)	1m 59s
Build Mimiker (aarch64-kcsan)	2m 12s
Build Mimiker (riscv32-kasan)	1m 52s
Build Mimiker (riscv64-kasan)	2m 0s
Test Kernel (mips-kasan, kernel)	5m 17s
Test Kernel (mips-kasan, user)	16m 38s
Test Kernel (aarch64-kasan, kernel)	4m 11s
Test Kernel (aarch64-kasan, user)	16m 38s
Test Kernel (aarch64-kcsan, kernel)	5m 45s
Test Kernel (aarch64-kcsan, user)	4m 31s
Test Kernel (riscv64-kasan, kernel)	9m 53s
Test Kernel (riscv64-kasan, user)	16m 37s
	1h 30m 6s

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