Switching QIR profiles does not refresh test explorer view

[swernli]

When using a project that has tests compiled for "Unrestricted" (like the chemistry library at https://github.com/microsoft/qsharp/tree/main/library/chemistry), if the QIR profile in the editor is set to Base when openning the first file the tests do no show up (as expected). However, changing the profile to "Unrestricted" won't show the tests, even if the refresh button in the test explorer is hit. Only editing the project to force a document update, closing all the files to the project (so it gets unloaded) or explicitly reloading the window causes the new tests to get picked up.

We should try to treat the change of QIR profile as a document update so that the test explorer updates it's view.