Update to Dashboard 2.2.0 and use its placeholder block instead our our polyfilled version
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3566812. --> Reported by: [phenaproxima](https://www.drupal.org/user/205645) Related to !753 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Dashboard 2.2.0 is out, and it includes a placeholder block plugin which was ported from our helper module, which originated it as a way for dashboards to have "light" integrations with various modules.</p> <p>We should adopt the official plugin now and remove our polyfill.</p> <p>Because the official plugin has a different ID, <strong>this is a breaking change</strong>. However, the polyfill was never in a stable version of Drupal CMS, and there is no guarantee of stability in non-stable versions.</p> > Related issue: [Issue #3557882](https://www.drupal.org/node/3557882)
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