Satellite upgrade to 6.4.3 failed with `NoMethodError: undefined method `import_product_content' for Katello::Glue::Candlepin::Product:Module`

Solution In Progress - Updated -

Issue

When trying to upgrade Satellite from 6.3 to 6.4.3, the following error is happening at the "import_product_content" stage:

NoMethodError: undefined method `import_product_content' for Katello::Glue::Candlepin::Product:Module
Did you mean?  import_from_cp

or

foreman-rake katello:upgrades:3.6:import_product_content failed! Check the output for error!
Upgrade step import_product_content failed. Check logs for more information.
                                      [FAIL]

Environment

Red Hat Satellite upgrading to 6.4.3

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