Remove the remaining templateprocessor subspec from React-Fabric.podspec (#55140)

Summary:
A few years ago, the source files of the **templateprocessor module** were removed from the React Native codebase. Based on the linked pull request, these files were no longer used. However, based on my investigation, the subspec of this module was missed and is still defined in _packages/react-native/ReactCommon/React-Fabric.podspec_.

#39487

During an open-source scan, the `templateprocessor` module was detected, but its source code could not be found. After further investigation, I found that this module is no longer in use.

## Changelog:

[Internal] [Removed] – Remove the remaining templateprocessor subspec from React-Fabric.podspec

Pull Request resolved: #55140

Reviewed By: cipolleschi

Differential Revision: D90587269

Pulled By: javache

fbshipit-source-id: 9070e8631e9d1dc6bea88e62e7bebc00ec20608f

Author: Beáta Brassai

packages/react-native/ReactCommon/React-Fabric.podspec

@@ -187,12 +187,6 @@ Pod::Spec.new do |s|
     end
   end
 
-  s.subspec "templateprocessor" do |ss|
-    ss.source_files         = podspec_sources("react/renderer/templateprocessor/**/*.{m,mm,cpp,h}", "react/renderer/templateprocessor/**/*.h")
-    ss.exclude_files        = "react/renderer/templateprocessor/tests"
-    ss.header_dir           = "react/renderer/templateprocessor"
-  end
-
   s.subspec "telemetry" do |ss|
     ss.source_files         = podspec_sources("react/renderer/telemetry/**/*.{m,mm,cpp,h}", "react/renderer/telemetry/**/*.h")
     ss.exclude_files        = "react/renderer/telemetry/tests"