Replace chip key with non-array index

Address a lint error (rule: react/no-array-index-key) by using
chip.key prop val instead of an array index for the component key.

awx/ui_next/src/components/Lookup/HostFilterLookup.jsx

@@ -279,8 +279,8 @@ function HostFilterLookup({
               numChips={5}
               totalChips={chips[key]?.chips?.length || 0}
             >
-              {chips[key]?.chips?.map((chip, index) => (
-                <Chip key={index} isReadOnly>
+              {chips[key]?.chips?.map(chip => (
+                <Chip key={chip.key} isReadOnly>
                   {chip.node}
                 </Chip>
               ))}