This reverts commit d54fbc01234688b37a48b29fee499529a500ccf5.
Since all incremental tests are flaky on Windows, this is reinstated and
all test-incremental tests will be skipped on Windows until the
flakiness is resolved.
Closes#26003
This reverts commit 133abdeda2994886c3476a3faf53f8a911513b32 but keeps
the tests disabled for the wasm target, which is the only configuration
that seems to fail, even though the error looks like a frontend error.
Throw another target in there just to spice things up a little!
Running the incremental cases with the C backend is pretty slow due to
the need to recompile the whole output from scratch on every update; for
this reason, we probably don't want to keep many of these targeting CBE
long-term. However, for now, while we have relatively few tests and
things are still changing quite a lot, it's better to have this little
bit of extra test coverage.
