Add gitignore entries

Author: wu-hui

.gitignore

@@ -4,6 +4,7 @@ dist
 .awcache
 .cache
 /config/project.json
+/config/prod.project.json
 scripts/docgen-compat/html
 
 # OS Specific Files
@@ -100,4 +101,4 @@ docs/
 
 # vertexai test data
 vertexai-sdk-test-data
-mocks-lookup.ts
+mocks-lookup.ts