Ensure field_plugin_method are set correctly when exporting

Problem/Motivation

When running migrations after --configure-only, the migrations for field formatter settings, etc were getting errors that about an input parameter can't be null. The error occurs in this line call_user_func([$this->fieldPluginCache[$field_type], $method], $this); in FieldMigration::getProcess(). The method should be the field_plugin_method that is defined in the migration. However, it is never setup in MigrateUpgradeDrushRunner.php.

Proposed resolution

Make a patch etc.

Remaining tasks

N/A

User interface changes

N/A

API changes

N/A

Data model changes

N/A