Revert "Remove semantic model keep-alive code in completion (#73844)" #74302
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This reverts #73844
The changes to completion were causing failing Linux DotNet 7 & 8 tests in the C# extension Roslyn insertion (see dotnet/vscode-csharp#7273).
Test run with revert: https://dev.azure.com/dnceng-public/public/_build/results?buildId=735073&view=results