Check that distance from A to B is same as from B to A

Issue:
https://github.com/genenetwork/gn-gemtext-threads/blob/main/topics/gn1-migration-to-gn2/clustering.gmi

* gn3/computations/slink.py: check that the distance from child A to B is the
  same as distance from child B to A. If not, throw an exception.

* tests/unit/computations/test_slink.py:
  * Change the name of the test to more closely correspond to the business
    logic being tested.
  * Update the data in a separate test such that it does not error out due to
    failing to fulfill the expectations of separate requirement.

- pass tests
- Rename test
- Fix errors: distances same both directions

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