avoid logging update requests error when WP_HTTP_BLOCK_EXTERNAL is set

[dpik]

When WP_HTTP_BLOCK_EXTERNAL is set, error log is growing fast.

wp-includes/update.php unconditionally reports an error when the request failed:

trigger_error( __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="https://wordpress.org/support/">support forums</a>.' ) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ), headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE );

if user blocked external requests, I think it should not be logged.

I suggest we check if url is blocked before making the request and silently return if we can't. See diff file implementing this.

[dpik]

wp-includes/update.php patch

[jesin]

Duplicate of #29719.