Build/Test Tools: Ensure PHPCS related workflows are properly marked as failed.

When a ruleset error is encountered during a PHPCodeSniffer scan, an XML report is not generated and `cs2pr` will exit with a `0`.

In this situation, a workflow run will be marked as passing (even though a failure has occurred) due to the presence of `continue-on-error`.

This adjusts the logic in the Coding Standards and PHP Compatibility workflows to remove the need for the `continue-on-error` option and ensures all failures are accurately reflected within the GitHub Actions UI.

Follow up to [54371].

Props jrf, TobiasBg.
Merges [54678] to the 6.1 branch.
See #55652.
Built from https://develop.svn.wordpress.org/branches/6.1@54681


git-svn-id: http://core.svn.wordpress.org/branches/6.1@54233 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-RC2-54680';
+$wp_version = '6.1-RC2-54681';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.