Add support for "default" destination to flow-filter stage #4932

Job	Run time
Deduce required tests from code changes	3s
version	16s
release sterile	15m 59s
fuzz sterile	13m 29s
debug sterile	15m 24s
debug	10m 11s
v-gw-iso-l3vni / run	22m 32s
v-up25.05-gw-iso-l2vni / run	44m 18s
v-gw-iso-l2vni / run	22m 54s
h-gw-iso-l2vni / run	0s
Summary	4s
publish	0s
	2h 25m 10s

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