clear pod cpuset to support "cpuManagerPolicy=static" #1426

Job	Run time
tests (vmm/sandbox, --all-features)	3m 39s
checks (vmm/sandbox, --all-features)	2m 14s
tests (vmm/task, --all-features)	3m 16s
checks (vmm/task, --all-features)	2m 33s
tests (shim, --all-features)	2m 32s
checks (shim, --all-features)	2m 31s
tests (quark, --all-features)	2m 31s
checks (quark, --all-features)	2m 32s
tests (runc, --all-features)	2m 52s
checks (runc, --all-features)	2m 34s
tests (wasm, --features=wasmedge, 0.13.5)	3m 17s
checks (wasm, --features=wasmedge, 0.13.5)	2m 32s
tests (wasm, --features=wasmtime)	3m 49s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	2m 32s
checks (wasm, --features=wasmtime)	2m 33s
	41m 57s

Provide feedback