Fix Clean-AntreaNetwork.ps1 invocation in Prepare-AntreaAgent.ps1 #29794

Job	Run time
Check whether tests need to be run based on diff	18s
Build Antrea image to be used for Kind e2e tests	12m 19s
Build Flow Aggregator image to be used for Kind e2e tests	3m 34s
E2e tests on a Kind cluster on Linux with all features enabled	54m 37s
E2e tests on a Kind cluster on Linux	44m 48s
E2e tests on a Kind cluster on Linux (hybrid)	37m 7s
E2e tests on a Kind cluster on Linux for Flow Visibility	30m 56s
E2e tests on a Kind cluster on Linux with non default values (proxyAll=true, LoadBalancerMode=DSR...	48m 25s
E2e tests on a Kind cluster on Linux (noEncap)	36m 43s
API compatible with client version N-1	8m 55s
API compatible with client version N-2	9m 17s
Upgrade from Antrea version N-1	9m 17s
NetworkPolicy conformance tests on a Kind cluster on Linux	8m 22s
Upgrade from Antrea version N-2	9m 10s
Validate metrics in Prometheus document match running deployment's	2m 7s
Delete uploaded images	2s
	5h 15m 57s

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