Storing entity storage as a class property is not recommended [#3623682]

Problem/Motivation

Scanning the module with phpstan or Upgrade Status results in,

Storing entity storage as a class property is not recommended. Call Drupal\Core\Entity\EntityTypeManagerInterface::getStorage() at the call-site instead.

Proposed resolution

Call getStorage() instead.

API changes

Theoretically, a third-party class that extended the offending class could have to change its structure as well.

Issue fork inline_entity_form-3623682

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3623682-storing-entity-storage changes, plain diff MR !177
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