Issue #3025397 by bluegeek9: PageGeneralForm::submitForm() should not use...

Steven Ayersrequested to merge
issue/page_manager-3025397:3025397-pagegeneralformsubmitform-should-not into 8.x-4.x

Issue #3025397 by bluegeek9: PageGeneralForm::submitForm() should not use \Drupal to instantiate storage

Closes #3025397

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