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.

git-svn-id: https://develop.svn.wordpress.org/trunk@53723 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-xmlrpc-server.php

@@ -7013,7 +7013,7 @@ class wp_xmlrpc_server extends IXR_Server {
 		$context        = '[…] ' . esc_html( $excerpt ) . ' […]';
 		$pagelinkedfrom = $this->escape( $pagelinkedfrom );
 
-		$comment_post_ID      = (int) $post_ID;
+		$comment_post_id      = (int) $post_ID;
 		$comment_author       = $title;
 		$comment_author_email = '';
 		$this->escape( $comment_author );
@@ -7022,8 +7022,11 @@ class wp_xmlrpc_server extends IXR_Server {
 		$this->escape( $comment_content );
 		$comment_type = 'pingback';
 
-		$commentdata = compact(
-			'comment_post_ID',
+		$commentdata = array(
+			'comment_post_ID' => $comment_post_id,
+		);
+
+		$commentdata += compact(
 			'comment_author',
 			'comment_author_url',
 			'comment_author_email',