* Tagging VB/C# Ioperation tests

* Fix the Wrong Tagging

* Adding ioperation tests for WhileUntilLoopStatement

* Addressing Feedback

* Removing redundant Nested tests

* Removing the empty lines

Merging on behalf of @svick 
Thanks for the contribution!

Changes BuildBoss to enforce portable test projects use the
UnitTestPortable label. Probably going to remove that in the near future
but at this point it's still required.

Fixes #21136

* Rename Foo to Goo

* Rename ifoo to igoo

* Add back BOMs

* Expose if a Binary/Unary operator was 'Lifted' at the IExpression level.

* Update public API.

* Share computed value.

* Remove unnecessary extension.

* Update test code.

* Remove extension method.

* Fixup tests.

* Fixup tests.

* Fixup tests.

* Fix instances of Invalid operations with nullable

* Compound assignments also need to state if they're lifted.

* Move tests.

* Move tests.

* Move tests.

* Simplify comment.

* Case things consistently.

* Use F instead of Foo.  Because Foo is bad.