feat(dcim): Add 50G, 800G, and 1.6T interface speed options (#21796)

Adds support for 50 Gbps, 800 Gbps, and 1.6 Tbps interface speeds to
the InterfaceSpeedChoices to cover newer high-speed networking hardware.

netbox/dcim/choices.py

@@ -1518,9 +1518,12 @@ class InterfaceSpeedChoices(ChoiceSet):
         (10000000, '10 Gbps'),
         (25000000, '25 Gbps'),
         (40000000, '40 Gbps'),
+        (50000000, '50 Gbps'),
         (100000000, '100 Gbps'),
         (200000000, '200 Gbps'),
         (400000000, '400 Gbps'),
+        (800000000, '800 Gbps'),
+        (1600000000, '1.6 Tbps'),
     ]