Tests: Extend RunCMake.Ninja filesystem delays
On filesystems with 1s resolution the run_sub_cmake cases fail
occasionally when the 1 second sleep does not cause files to have
a different time. Use 3 seconds instead.
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On filesystems with 1s resolution the run_sub_cmake cases fail
occasionally when the 1 second sleep does not cause files to have
a different time. Use 3 seconds instead.