Coding Standards: Rename $comment_post_ID and $comment_author_IP variables in various files.

This fixes two WPCS warnings:
* `Variable "$comment_post_ID" is not in valid snake_case format`
* `Variable "$comment_author_IP" is not in valid snake_case format`

While matching the database fields of the same name, these variables did not follow the WordPress coding standards, and are now renamed to address that.

Note: The name change only affects internal variables and parameters for a few actions receiving a comment post ID:

* `edit_comment`
* `comment_id_not_found`
* `comment_closed`
* `comment_on_trash`
* `comment_on_draft`
* `comment_on_password_protected`
* `pre_comment_on_post`

The change does not affect parameters for functions receiving an array of comment data:

* `wp_insert_comment()`
* `wp_new_comment()`
* `wp_update_comment()`
* `wp_handle_comment_submission()`

The associated array keys still match the database fields: `comment_post_ID` and `comment_author_IP`.

Follow-up to [1706], [2894], [8720], [28427], [28437], [28457], [34799], [53720],

See #55647, #56244.
Built from https://develop.svn.wordpress.org/trunk@53723


git-svn-id: http://core.svn.wordpress.org/trunk@53282 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post.php

@@ -4335,7 +4335,29 @@ function wp_insert_post( $postarr, $wp_error = false, $fire_after_hooks = true )
 	$post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';
 
 	// Expected_slashed (everything!).
-	$data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' );
+	$data = compact(
+		'post_author',
+		'post_date',
+		'post_date_gmt',
+		'post_content',
+		'post_content_filtered',
+		'post_title',
+		'post_excerpt',
+		'post_status',
+		'post_type',
+		'comment_status',
+		'ping_status',
+		'post_password',
+		'post_name',
+		'to_ping',
+		'pinged',
+		'post_modified',
+		'post_modified_gmt',
+		'post_parent',
+		'menu_order',
+		'post_mime_type',
+		'guid'
+	);
 
 	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );