Track editors instantiated after loading Insert

When changing the text format, the re-instantiated editor is recognised now. However, the default insert target cannot be reliably updated until #3319358 ✨ Trigger event when Text Editor is attached Needs work is resolved in Drupal core. Therefore, after switching the text format, e.g. on the node body editor, it cannot be assumed that the default insertion target is updated with the new editor instance. Therefore, the user needs to click into the editor to have content inserted into it.

Leaving it like that for the moment, since changing the text format is likely more of a rare case. As soon as a resolution is implemented in Drupal core, the default target detection can be improved.

Automatically closed - issue fixed for 2 weeks with no activity.