fix: codegen - project paths with spaces (#31141)

Summary:
- Fixed iOS codegen script incorrectly splitting root project paths that contain spaces
react-native-community/releases#214 (comment)

iOS builds were failing on 0.64.0-rc.4 for projects that contained spaces in the root directory path. The error logs pointed to the codegen script not being able to find a directory. The path was being split at a space in one of the folder names. This PR modifies the codegen script to include the spaces and use the entire project root path.

## Changelog

[Internal] fix: codegen script failing for iOS builds on projects with spaces in root directory path

Pull Request resolved: #31141

Test Plan:
Failing Test: Upgrade or init a new project and make sure that the project root directory contains a space (ex: /Users/test/cool projects/app/). With a clean install of node_modules and pods, attempt to build the project with Xcode. The build fails with an error running the script in FBReactNativeSpec (no such file or directory).

Passing Test: Include the changes presented in this PR and rerun the failing test (clean node_modules + PR patch/clean pods). The app should build.

Reviewed By: mdvacca

Differential Revision: D28255539

Pulled By: hramos

fbshipit-source-id: d44011985750639bd2fabfd40ed645d4eb661bd7

Author: mysport12

scripts/react_native_pods.rb

@@ -163,9 +163,9 @@ def use_react_native_codegen!(spec, options={})
   modules_output_dir = "React/#{modules_library_name}/#{modules_library_name}"
 
   # Run the codegen as part of the Xcode build pipeline.
-  env_vars = "SRCS_DIR=#{js_srcs}"
-  env_vars += " MODULES_OUTPUT_DIR=#{prefix}/#{modules_output_dir}"
-  env_vars += " MODULES_LIBRARY_NAME=#{modules_library_name}"
+  env_vars = "SRCS_DIR='#{js_srcs}'"
+  env_vars += " MODULES_OUTPUT_DIR='#{prefix}/#{modules_output_dir}'"
+  env_vars += " MODULES_LIBRARY_NAME='#{modules_library_name}'"
 
   generated_dirs = [ modules_output_dir ]
   generated_filenames = [ "#{modules_library_name}.h", "#{modules_library_name}-generated.mm" ]
@@ -176,7 +176,7 @@ def use_react_native_codegen!(spec, options={})
     # Eventually, we want these to be part of the same library as #{modules_library_name} above.
     components_output_dir = "ReactCommon/react/renderer/components/rncore/"
     generated_dirs.push components_output_dir
-    env_vars += " COMPONENTS_OUTPUT_DIR=#{prefix}/#{components_output_dir}"
+    env_vars += " COMPONENTS_OUTPUT_DIR='#{prefix}/#{components_output_dir}'"
     components_generated_filenames = [
       "ComponentDescriptors.h",
       "EventEmitters.cpp",
@@ -198,5 +198,5 @@ def use_react_native_codegen!(spec, options={})
     :execution_position => :before_compile,
     :show_env_vars_in_log => true
   }
-  spec.prepare_command = "mkdir -p #{generated_dirs.reduce("") { |str, dir| "#{str} ../../#{dir}" }} && touch #{generated_files.reduce("") { |str, filename| "#{str} ../../#{filename}" }}"
+  spec.prepare_command = "mkdir -p #{generated_dirs.map {|dir| "'../../#{dir}'"}.join(" ")} && touch #{generated_files.map {|file| "'../../#{file}'"}.join(" ")}"
 end