LanguageServerCleansUpOnUnexpectedJsonRpcDisconnectAsync is flaky

[runfoapp]

Runfo Tracking Issue: LanguageServerCleansUpOnUnexpectedJsonRpcDisconnectAsync is flaky

Build	Definition	Kind	Run Name

Build Result Summary

Day Hit Count	Week Hit Count	Month Hit Count
0	0	0

[tmat]

Another hit: https://dev.azure.com/dnceng-public/public/_build/results?buildId=705579&view=ms.vss-test-web.build-test-results-tab&runId=17597376&resultId=163182&paneView=debug

[dibarbet]

Was fixed in #73997

The run linked above is from June 12th, before the fix went in.