[codesign] remove metadata files for now (#2758)

Remove codesign metadata after parsing them.

Context: fix flutter/flutter#126705 by removing codesign metadata after parsing them. When flutter/flutter#126875 becomes ready, we could add back codesign metadata inside engine zips?

Sorry for the delay, was busy landing different cps during the day

codesign/lib/src/file_codesign_visitor.dart

@@ -334,7 +334,12 @@ update these file paths accordingly.
     }
 
     final Set<String> fileWithEntitlements = <String>{};
+
     fileWithEntitlements.addAll(await fileSystem.file(entitlementFilePath).readAsLines());
+    // TODO(xilaizhang) : add back metadata information after https://github.com/flutter/flutter/issues/126705
+    // is resolved.
+    await fileSystem.file(entitlementFilePath).delete();
+
     return fileWithEntitlements;
   }