Update export flow for JS outputs #1676

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4 errors and 10 warnings

test outputs serializes js output data to JSON if not binary (Livebook.LiveMarkdown.ExportTest)

test outputs includes js output with legacy export info (Livebook.LiveMarkdown.ExportTest)

test outputs exports partial js output data when export_key is set (Livebook.LiveMarkdown.ExportTest)

Process completed with exit code 2.

use Bitwise is deprecated. import Bitwise instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

use Bitwise is deprecated. import Bitwise instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead