Revert "Move graph cycle detection to rust. (#11202)" (cherrypick of #11272) #11275
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#11202 introduced a lot of contention on the GIL that was only obvious when larger numbers of targets were being built. #11270 is a holistic fix for that issue, but it is currently blocked on #11269.
In the meantime, we will land #11271 to dodge the original issue in #11201 to get us back to a medium-slow-but-working state, and then follow up on #11269 and #11270 to get us to the best place.
This reverts commit fabcb45.
[ci skip-build-wheels]