Remove unnecessary cancellation of diagnostics requests. #77883
Merged
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This code originally existed for TypeScript. The TS impl could only handle one request at a time. So if they were queried for lightbulbs while diags were computing, they were blocked. This is no longer the case. And TS doesn't even use us for diags anymore (they use LSP). So we don't need this code to try to cancel diags when lightbulbs are queried.