[Cmake] Make better use of bazel to reduce the amount of hand-authored CMake code

See for context: https://github.com/iree-org/iree/pull/22775#pullrequestreview-3515972644

There exists a lot of CMake code within our codebase which can benefit from bazel-to-cmake (even if all our CMake code is not completely generatable via Bazel). It might be worth documenting such opportunities for improvement.