[0.85] Add RCTDevSupportHeaders to React Umbrella

[motiz88]

Target Branch

0.85-stable

Link to commit or PR to be picked

facebook/react-native#56643

Description

Cherry-pick of facebook/react-native#55974 from main. Adds RCTDevSupportHeaders to the React umbrella header on iOS. Previously picked to 0.83-stable as facebook/react-native#55969.

cc @cipolleschi

[github-actions]

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