Add 'type' arg for antctl get bgproutes to filter bgproutes #31881

Job	Run time
Compute outputs for use by other jobs	22s
build (linux/amd64, ubuntu-latest, amd64)	2m 37s
build-scale	1m 53s
build (linux/arm64, github-arm64-2c-8gb, arm64)	4m 28s
build (linux/arm/v7, github-arm64-2c-8gb, arm)	5m 40s
build-windows	2m 39s
build-ubi	4m 9s
build-antrea-mc-controller	3m 20s
build-antrea-migrator	15s
build-flow-aggregator	2m 5s
push-manifest	0s
	27m 28s

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