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Add cache entry `CMAKE_GENERATOR_INSTANCE` to hold the instance location
persistently across re-runs of CMake in a given build tree.
For now we reject the option by default if explicitly set. It will be
implemented on a per-generator basis. Pass the setting into try_compile
project generation. Add a RunCMake.GeneratorInstance test to cover
basic use cases for the option. Verify that `CMAKE_GENERATOR_INSTANCE`
is empty by default, and that it is rejected when the generator does not
support a user setting.
Issue: #17268
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