Trac 64012 avoid counting post editor admin inline comments alongside user comments

[risto987]

This PR modifies the get_pending_comments_num() function to exclude editorial comments from the pending count and makes the function more extensible.

Changes Made:

Fixed the query by excluding block_comment type.

Added extensibility: Introduced the pre_get_pending_comments_num filter hook. This allows developers to modify the query arguments used for counting, making it future-proof for custom comment types or additional filtering needs.

Trac ticket: https://core.trac.wordpress.org/ticket/64012

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