Need to join on entity type when using views_handler_relationship_entity_reverse

Problem/Motivation

1) Add same paragraph field to comments and node entities
2) create a view of paragraph items
3) add relationships to comment and node tables from paragraph item.
4) add node title and comment title
Expected: if paragraph item attached to node, shows node title. for paragraph item attached to comment, shows comment title
Actual: if there is a paragraph item attached to a node with the same id (nid: 15) as comment (cid: 15), it shows the node titles and the same id comment title.

Proposed resolution

I suggest we fully rely on what's views itself is doing:

All define following extra conditions for the join:

    'join_extra' => array(
        0 => array(
          'field' => 'entity_type',
          'value' => $entity_type,
        ),
        1 => array(
          'field' => 'deleted',
          'value' => 0,
          'numeric' => TRUE,
        ),
      ),

Remaining tasks

Needs reviews.

User interface changes

None

API changes

None.

Data model changes

None.