Can't add new report actions in Debug mode

[DylanDylann]

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Coming from https://github.com/Expensify/App/issues/53027#issuecomment-2500692010

https://github.com/Expensify/App/blob/3f4e93ee40462b42f5fe331fdf9db5c9bbb1a421/src/pages/Debug/ReportAction/DebugReportActionCreatePage.tsx#L117

we use the set method but we don't add the previous data. It caused when adding new report action, all previous report actions will be removed

cc @pac-guerreiro @puneetlath @JKobrynski