Direct injection of entity storage via $storage is not recommended [#3620756]

Problem/Motivation

Scanning this module with Upgrade Status results in,

Direct injection of entity storage via $storage is not recommended. Inject Drupal\Core\Entity\EntityTypeManagerInterface and call getStorage() at the call-site instead.

Proposed resolution

call getStorage() instead

API changes

Potentially a third party module that extends the offending class(es) could be impacted.

Issue fork context-3620756

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3620756-storage-injection changes, plain diff MR !74
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