Add unit-test for issue influxdata#13305

plugins/inputs/netflow/testcases/issue_13305/expected.out

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+netflow,source=127.0.0.1,version=IPFIX ip_version="IPv4",dst_port=44400u,dst_tos="0x00",flow_end_ms=1684767922502u,type_35632_127="0x00000000",flow_start=1684767922u,src="192.168.2.203",flow_end=1684767922u,type_35632_493="0x0000",first_switched=22474460u,type_35632_188="",protocol="udp",in_src_mac="0x005056b386e7",type_35632_128="0x00000000",in_snmp=0u,src_mask=0u,out_snmp=0u,type_35632_124="0x00000000",type_35632_494="0x00",in_bytes=122u,type_35632_110="0x00000000",out_dst_mac="0x005056b3a7f8",type_35632_490="",dst_mask=0u,type_35632_495="0x0000",last_switched=22474460u,in_packets=1u,type_35632_123="0x00000000",dst="189.127.188.175",src_tos="0x00",type_35632_118="0x0025",type_35632_125="0x00000000",next_hop="0.0.0.0",src_port=51413u,tcp_flags="........",flow_start_ms=1684767922502u,type_35632_489="",type_35632_109="0x00000000" 1684848566299341667
+netflow,source=127.0.0.1,version=IPFIX src_mask=0u,out_snmp=0u,type_35632_188="",type_35632_118="0x0025",type_35632_109="0x00000000",type_35632_124="0x00000000",in_packets=1u,dst="177.234.165.79",dst_port=47707u,type_35632_125="0x00000000",tcp_flags="........",flow_end=1684767922u,type_35632_128="0x00000000",protocol="udp",type_35632_490="",dst_mask=0u,last_switched=22474460u,flow_end_ms=1684767922502u,type_35632_489="",in_bytes=86u,type_35632_123="0x00000000",next_hop="0.0.0.0",ip_version="IPv4",src_port=51413u,dst_tos="0x00",type_35632_494="0x00",src="192.168.2.203",type_35632_127="0x00000000",flow_start_ms=1684767922502u,type_35632_493="0x0000",in_src_mac="0x005056b386e7",flow_start=1684767922u,first_switched=22474460u,out_dst_mac="0x005056b3a7f8",src_tos="0x00",type_35632_110="0x00000000",type_35632_495="0x0000",in_snmp=0u 1684848566299737019

plugins/inputs/netflow/testcases/issue_13305/telegraf.conf

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+[[inputs.netflow]]
+  service_address = "udp://127.0.0.1:0"