Arrays of Enumerations without a value for 0 are no longer valid (#8836)

* arrays of enums with no value for 0 now throw errors

* move setting key field outside struct check

* set to default instead of required

* unsure of why these bfbs files have changed at this time, checking them in to run the pipelines.

* remove known bad test

tests/non_zero_enum.fbs

@@ -2,9 +2,10 @@ enum NonZero: ubyte {
     VAL = 1,
 }
 
-struct NonZeroArrayStruct {
-    data: [NonZero:4];
-}
+// this now is not allowed because arrays of enums must have a zero value
+// struct NonZeroArrayStruct {
+//     data: [NonZero:4];
+// }
 
 table NonZeroVectorTable {
     values: [NonZero];