Issue #3572772: Refactor MyrestMetatagForm to remove custom entity...

Sergey Drakrequested to merge
issue/myrest_metatag-3572772:3572772-refactor-myrestmetatagform-to into 1.0.x

Issue #3572772: Refactor MyrestMetatagForm to remove custom entity dependencies and use EntityTypeManager

Closes #3572772

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