fix(ios): allow pods mixte type settings on post-install (#46536)

Summary:
Following the discussion on #46505, this PR aims to allow mixte type configuration (String and/or Array of String) during the post installation of pods.

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[IOS] [FIXED] - allow pods mixte type settings on post-install

Pull Request resolved: #46536

Test Plan: `packages/react-native/scripts/cocoapods/__tests__/utils-test.rb` test suits was updated to support array and works as expected

Reviewed By: shwanton

Differential Revision: D62870582

Pulled By: cipolleschi

fbshipit-source-id: c0ace6d9d20e6609ceae5aafd236d97fc9e86ddf

packages/react-native/scripts/cocoapods/__tests__/utils-test.rb

@@ -1116,6 +1116,26 @@ def test_add_flag_to_map_with_inheritance_whenUsedWithXCConfigAttributes
         assert_equal("$(inherited)" + test_flag, twiceProcessed_xcconfig.attributes["OTHER_CPLUSPLUSFLAGS"])
     end
 
+    def test_add_flag_to_map_with_inheritance_whenUsedWithArrayAttributes
+        # Arrange
+        initialized_xcconfig = XCConfigMock.new("InitializedConfig", attributes: {
+            "OTHER_CPLUSPLUSFLAGS" => ["INIT_FLAG"]
+        })
+        twiceProcessed_xcconfig = XCConfigMock.new("TwiceProcessedConfig", attributes: {
+            "OTHER_CPLUSPLUSFLAGS" => []
+        })
+        test_flag = " -DTEST_FLAG=1"
+
+        # Act
+        ReactNativePodsUtils.add_flag_to_map_with_inheritance(initialized_xcconfig.attributes, "OTHER_CPLUSPLUSFLAGS", test_flag)
+        ReactNativePodsUtils.add_flag_to_map_with_inheritance(twiceProcessed_xcconfig.attributes, "OTHER_CPLUSPLUSFLAGS", test_flag)
+        ReactNativePodsUtils.add_flag_to_map_with_inheritance(twiceProcessed_xcconfig.attributes, "OTHER_CPLUSPLUSFLAGS", test_flag)
+
+        # Assert
+        assert_equal(["$(inherited)", "INIT_FLAG", test_flag], initialized_xcconfig.attributes["OTHER_CPLUSPLUSFLAGS"])
+        assert_equal(["$(inherited)", test_flag], twiceProcessed_xcconfig.attributes["OTHER_CPLUSPLUSFLAGS"])
+    end
+
     def test_add_ndebug_flag_to_pods_in_release
         # Arrange
         xcconfig = XCConfigMock.new("Config")

packages/react-native/scripts/cocoapods/utils.rb

@@ -696,10 +696,18 @@ def self.add_flag_to_map_with_inheritance(map, field, flag)
             map[field] = "$(inherited)" + flag
         else
             unless map[field].include?(flag)
-                map[field] = map[field] + flag
+                if map[field].instance_of? String
+                    map[field] = map[field] + flag
+                elsif map[field].instance_of? Array
+                    map[field].push(flag)
+                end
             end
             unless map[field].include?("$(inherited)")
-                map[field] = "$(inherited) " + map[field]
+                if map[field].instance_of? String
+                    map[field] = "$(inherited) " + map[field]
+                elsif map[field].instance_of? Array
+                    map[field].unshift("$(inherited)")
+                end
             end
         end
     end