Refactor iosxr_facts to use network_cli plugin (#20857)

test/units/modules/network/iosxr/fixtures/show_interfaces

@@ -0,0 +1,41 @@
+Loopback0 is up, line protocol is up 
+  Interface state transitions: 1
+  Hardware is Loopback interface(s)
+  Description: Loopback
+  Internet address is 192.168.0.3/32
+  MTU 1500 bytes, BW 0 Kbit
+     reliability Unknown, txload Unknown, rxload Unknown
+  Encapsulation Loopback,  loopback not set,
+  Last link flapped 12w1d
+  Last input Unknown, output Unknown
+  Last clearing of "show interface" counters Unknown
+  Input/output data rate is disabled.
+
+GigabitEthernet0/0/0/0 is up, line protocol is up 
+  Interface state transitions: 1
+  Hardware is GigabitEthernet, address is fa16.3e6c.20bd (bia fa16.3e6c.20bd)
+  Description: to nxos01
+  Internet address is 10.0.0.5/30
+  MTU 1514 bytes, BW 1000000 Kbit (Max: 1000000 Kbit)
+     reliability 255/255, txload 0/255, rxload 0/255
+  Encapsulation ARPA,
+  Full-duplex, 1000Mb/s, unknown, link type is force-up
+  output flow control is off, input flow control is off
+  Carrier delay (up) is 10 msec
+  loopback not set,
+  Last link flapped 12w1d
+  ARP type ARPA, ARP timeout 04:00:00
+  Last input 00:00:44, output 00:12:45
+  Last clearing of "show interface" counters never
+  5 minute input rate 0 bits/sec, 0 packets/sec
+  5 minute output rate 0 bits/sec, 0 packets/sec
+     150700 packets input, 36897055 bytes, 0 total input drops
+     0 drops for unrecognized upper-level protocol
+     Received 1 broadcast packets, 150445 multicast packets
+              0 runts, 0 giants, 0 throttles, 0 parity
+     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
+     11691 packets output, 2904632 bytes, 0 total output drops
+     Output 1 broadcast packets, 11436 multicast packets
+     0 output errors, 0 underruns, 0 applique, 0 resets
+     0 output buffer failures, 0 output buffers swapped out
+     1 carrier transitions