mismatch content type should set on_error metadata in json_to_metadata filter (#33073)

* mismatch content type should set on_error metadata in json_to_metadata filter

Signed-off-by: kuochunghsu <kuochunghsu@pinterest.com>

Mirrored from https://github.com/envoyproxy/envoy @ 6aea06a3e9ba5ee7f5537cf0f70a72bdbb35ab72

envoy/extensions/filters/http/json_to_metadata/v3/json_to_metadata.proto

@@ -89,7 +89,7 @@ message JsonToMetadata {
     // The value in the KeyValuePair must be set.
     KeyValuePair on_missing = 3;
 
-    // If the body is too large or fail to parse, apply this metadata KeyValuePair.
+    // If the body is too large or fail to parse or content-type is mismatched, apply this metadata KeyValuePair.
     //
     // The value in the KeyValuePair must be set.
     KeyValuePair on_error = 4;