ci: Enable more VS tests that use managed code

A couple of VS tests were conditioned on `NOT CMAKE_GENERATOR_TOOLSET`,
but in CI jobs with VS we always set `CMAKE_GENERATOR_TOOLSET`.  Make
the condition specific to excluding the `v90` toolset, which was its
original intention anyway.
37 jobs for !6782 with ci-vs-managed in 46 minutes and 7 seconds (queued for 2 seconds)
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