[0.85] Add support for custom headers in devsupport

[cipolleschi]

Target Branch

0.85

Link to commit or PR to be picked

facebook/react-native#55976

Description

Backport of #55722 and #55969 (originally merged into 0.83) to 0.85. This adds custom header capability to devsupport for both Android and iOS, enabling scenarios where dev server connections require custom HTTP headers (e.g., authentication tokens).

The PR at facebook/react-native#55976 already contains all the necessary changes applied to the 0.85-stable branch.

[react-native-bot]

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