Remove declaration of the translation handler for Media Entity

Problem/Motivation

Annotation of the Media Entity Type contains a declaration of the translation handler. However, this is not necessary, because this handler will be added automatically by content_translation module. According to the content_translation_entity_type_alter() function comment:

If the entity paths match the default pattern above and there is no need for an entity-specific translation handler, Content Translation will provide built-in support for the entity.

Proposed resolution

Remove translation handler.

Remaining tasks

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User interface changes

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API changes

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Data model changes

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Release notes snippet

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