Some users are setting weird errors related to untitled TS files. In some of these cases (such as https://github.com/microsoft/TypeScript/issues/35091) we see a untitled file being sent to the tsserver without the `inMemoryResourcePrefix`.
I can't figure out how to get into this state but am removing the gating that *could* perhaps cause use not to set `inMemoryResourcePrefix`. This gating targets TS 2.7 or older, which telemetry shows very, very few users are still enabling in their workspaces
Matt Bierner
4e8ef4cf4d