[0.82] Gate legacy debugger behind a preprocessor directive

[j-piasecki]

Target Branch

0.82

Link to commit or PR to be picked

facebook/react-native#53578

Description

Changelog: [Internal]

Adds a new preprocessor directive which should be set when the new Hermes is being used. This directive will disable the legacy debugger which isn't supported by it.

[react-native-bot]

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