fix(translator): update data-plane test fixtures for streaming message_delta usage

Update tests/data-plane/testupstream_test.go expectations for the
anthropic-openai streaming text response and streaming tool call cases
to include input_tokens, cache_creation_input_tokens and
cache_read_input_tokens in message_delta.usage, matching the fix in
openai_helper.go.

Signed-off-by: ajac-zero <ajcardoza2000@gmail.com>

Author: ajac-zero

tests/data-plane/testupstream_test.go

@@ -1342,7 +1342,7 @@ event: content_block_stop
 data: {"type":"content_block_stop","index":0}
 
 event: message_delta
-data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null},"usage":{"output_tokens":3}}
+data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null},"usage":{"input_tokens":10,"output_tokens":3,"cache_creation_input_tokens":0,"cache_read_input_tokens":0}}
 
 event: message_stop
 data: {"type":"message_stop"}`,
@@ -1379,7 +1379,7 @@ event: content_block_stop
 data: {"type":"content_block_stop","index":0}
 
 event: message_delta
-data: {"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"output_tokens":15}}
+data: {"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"input_tokens":50,"output_tokens":15,"cache_creation_input_tokens":0,"cache_read_input_tokens":0}}
 
 event: message_stop
 data: {"type":"message_stop"}`,