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/comment-template.php

@@ -274,7 +274,7 @@ function get_comment_author_IP( $comment_ID = 0 ) { // phpcs:ignore WordPress.Na
 	 * @since 1.5.0
 	 * @since 4.1.0 The `$comment_ID` and `$comment` parameters were added.
 	 *
-	 * @param string     $comment_author_IP The comment author's IP address, or an empty string if it's not available.
+	 * @param string     $comment_author_ip The comment author's IP address, or an empty string if it's not available.
 	 * @param string     $comment_ID        The comment ID as a numeric string.
 	 * @param WP_Comment $comment           The comment object.
 	 */