Fix `context` to `context_definitions` in block plugins
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3223492. --> Reported by: [mglaman](https://www.drupal.org/user/2416470) >>> <h2>Problem / Motivation</h2> <p>I have <em>no idea</em> if we can do this. But we should see if we can Rector a plugin annotation for <a href="https://www.drupal.org/node/3016699">https://www.drupal.org/node/3016699</a></p>
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