Now that https://github.com/dotnet/roslyn/issues/36047 is fixed, unskip
type inferrer tests.

I added a test to ensure the inferrer no longer crashes, but
https://github.com/dotnet/roslyn/issues/36046 still blocks the ability
for it to actually pass. The test is then added skipped until that
works.

Fixes #27647

Fixes #30235

Fixes #30232

* Rename Foo to Goo

* Rename ifoo to igoo

* Add back BOMs

Fixes #13402

Tweak C# type inferrer to work in an incomplete object creation expression
followed by array indexing.

Fixes #1903

Infer enum type in IntelliSense after typing bitwise NOT operator

Fix #686

These tests were all using WpfFact, but not actually doing anything
that required either WPF or an STA thread. We plan to enable
parallelization of Facts (but not WpfFacts), and this ensures we can
parallelize as many tests as possible.