[CMake] add `SKIP` to `add_lit_testsuites` (#157176) This PR adds `SKIP` to `add_lit_testsuites`. The purpose is to let people filter the currently exhaustive inclusion of subdirectories which might not all depend on the same `DEPENDS`. The immediate use case is MLIR where we have a collection of Python tests that currently trigger rebuilds of various tools (like `mlir-opt`) which they do not depend on. That collection of tests is updated here too.
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