[LSP] Use test accessor task instead of async operation to wait for LSP server shutdown in tests #57824
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Using the async operation listener caused an issue in RPS when they wait for all async operations to be complete. Since this operation would not complete until VS shutsdown (and the LSP server is shutdown), RPS timed out.
Fixes rps issue in https://dev.azure.com/devdiv/DevDiv/_git/VS/pullrequest/364684#view=discussion
Val build in progress - https://devdiv.visualstudio.com/DevDiv/_build/results?buildId=5459216&view=results