Build/Test Tools: Automatically rerun a workflow the first time it fails.

There are several common reoccurring issues that sometimes cause GitHub Action workflows to fail (connection timeouts to WordPress.org or the Docker container registry, `npm install` failures, Chromium issues, etc.). Except when there are service level outages, most of these issues can be resolved by simply rerunning the workflow.

This introduces a new step within each of Core’s GitHub Action workflows that attempts to rerun the failed jobs within the workflow that encountered a failure if they are running for the first time. Since a workflow is not allowed to restart itself, a new `failed-workflow.yml` callable workflow is being introduced.

Other related adjustments in this changeset:
- The `actions/github-script` 3rd-party action is also now updated to the latest version (v6.2.0).
- A new secret, `GHA_WORKFLOW_DISPATCH`, has been introduced. This will replace the current one in use (`GHA_OLD_BRANCH_DISPATCH`) with a less specific name.

Props jorbin, desrosj.
Fixes #56407.
Built from https://develop.svn.wordpress.org/trunk@53947


git-svn-id: http://core.svn.wordpress.org/trunk@53506 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-alpha-53946';
+$wp_version = '6.1-alpha-53947';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.