[0.83] iOS: Add RCTDevSupportHttpHeaders to React-Core-Umbrella.h

[cipolleschi]

Target Branch

0.83

Link to commit or PR to be picked

facebook/react-native#55969

Description

As per title. We need the header in the umbrella to make it accessible to Swift.

[react-native-bot]

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[cipolleschi]

✅ Manually merged.