build(js): Fix `react-refresh` babel plugin always loaded in d… (#17492)
build(js): Fix `react-refresh` babel plugin always loaded in d… (#17492)

This fixes the `react-refresh` babel plugin from always being loaded in prod. We only want it loading when `SENTRY_UI_HOT_RELOAD` exists. Otherwise this was causing runtime errors in development when using without env var.
beeftornado/sentry,beeftornado/sentry,beeftornado/sentry