Add variants of UUR_KNOWN_FAILURE_ON to perform xfail and/or negative device matching

[RossBrunton]

Currently UUR_KNOWN_FAILURE_ON accepts a list of device specifiers and skips the tests if any match. It would be nice to extend this logic to:

• Mark the test as xfail (if such a thing exists in gtest), so that developers writing a patch would be notified of tests that they need to re-enable. Note that converting UUR_KNOWN_FAILURE_ON directly to use xfails will not work, as some tests segfault which would bring the whole test suite down.
• Use a negative match; "this test fails on every device except the ones matched by this specifier". Will be useful for testing features that are currently in development and do not work on every device yet.