Do not allow concurrent FindAllReferences requests for the same multibuffer anchors #9242
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FindAllReferences LSP requests might take a long time to complete, and currently Zed allows multiple requests spawned concurrently for the same Anchor in the multi buffer. That results in multiple search results' multi buffers appearing, sometimes at once, which is not what we want.
Part of #5351 that helps to reduce the amount of search results after clicks that did not resolve instantly.
Release Notes: