Add test to ensure that a CompletionService can be acquired #12201
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Issue #11841 found that, due to a MEF bug, the Features assemblies could not properly be included in a MEF composition. This was worked around by combining [ExtensionOrder] attributes where multiple attributes had been specified. This change adds a tests for C# and VB to ensure that a CompletionService can be acquired from an AdhocWorkspace that is created with MefHostServices that include the Features assemblies.
I verified that these tests fail without the workaound described above, and pass with the workaround in place.
cc @mattwar, @weltkante, @aelij, @dotnet/roslyn-ide