Remove IQueueItem abstraction and standardize CLSP queue pipeline on QueueItem

[Copilot]

IQueueItem doesnt seem to be implemented by any of the consumers. Having an interface for it seems unnecessary as it just makes any changes to the queue item more difficult.

[dibarbet]

@copilot please correct this CI error
src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs(162,137): error IDE0060: (NETCORE_ENGINEERING_TELEMETRY=Build) Remove unused parameter 'language' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0060)

[Copilot]

@copilot please correct this CI error
src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs(162,137): error IDE0060: (NETCORE_ENGINEERING_TELEMETRY=Build) Remove unused par...

Fixed in 78b5425. I removed the unused language parameter from QueueItem.StartRequestAsync, updated the RequestExecutionQueue call sites, and updated the affected unit test call accordingly.

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