fix: properly generate the airbyte_type (#13998)

Author: benmoriceau

airbyte-config/config-models/src/main/kotlin/io/airbyte/config/ConfiguredField.kt

@@ -25,7 +25,7 @@ enum class FieldType(val type: String, val format: String? = null, val airbyteTy
         "type" to type,
       )
     format?.let { result["format"] = it }
-    airbyteType?.let { result["airbyteType"] = it }
+    airbyteType?.let { result["airbyte_type"] = it }
 
     return result
   }

airbyte-mappers/src/test/kotlin/io/airbyte/mappers/transformations/DestinationCatalogGeneratorTest.kt

@@ -563,22 +563,22 @@ class DestinationCatalogGeneratorTest {
         "fieldTimestampWithoutTimezone": {
           "type": "string",
           "format": "date-time",
-          "airbyteType": "timestamp_without_timezone"
+          "airbyte_type": "timestamp_without_timezone"
         },
         "fieldTimestampWithTimezone": {
           "type": "string",
           "format": "date-time",
-          "airbyteType": "timestamp_with_timezone"
+          "airbyte_type": "timestamp_with_timezone"
         },
         "fieldTimeWithoutTimezone": {
           "type": "string",
           "format": "time",
-          "airbyteType": "time_without_timezone"
+          "airbyte_type": "time_without_timezone"
         },
         "fieldTimeWithTimezone": {
           "type": "string",
           "format": "time",
-          "airbyteType": "time_with_timezone"
+          "airbyte_type": "time_with_timezone"
         },
         "fieldObject": {
           "type": "object"