Update open buffers with newly registered completion trigger characters #41243
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Closes zed-extensions/java#108
Previously, when language servers dynamically register completion capabilities with trigger characters for completions (hello JDTLS), this would not get updated in buffers for that language server that were already open. This change is to find open buffers for the language server and update the trigger characters in each of them when the new capability is being registered.
Release Notes: