Update rncore podspec to exclude codegen test files (facebook#24513)

Summary:
Related facebook@bddd9c7. Exclude these tests files from podspec.

cc. cpojer

[iOS] [Fixed] - Update rncore podspec to exclude codegen test files
Pull Request resolved: facebook#24513

Differential Revision: D14996897

Pulled By: rickhanlonii

fbshipit-source-id: 28b29f24f482ed678f15c44c5c579ced97ea651f

Author: zhongwuzw

ReactCommon/React-Fabric.podspec

@@ -97,7 +97,7 @@ Pod::Spec.new do |s|
       sss.dependency             folly_dep_name, folly_version
       sss.compiler_flags       = folly_compiler_flags
       sss.source_files         = "fabric/components/rncore/*.{m,mm,cpp,h}"
-      sss.exclude_files        = "**/tests/*"
+      sss.exclude_files        = "**/tests/*", "fabric/components/rncore/*Tests.{h,cpp}"
       sss.header_dir           = "react/components/rncore"
       sss.pod_target_xcconfig  = { "HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)/ReactCommon\" \"$(PODS_ROOT)/Folly\"" }
     end