disable block-sequence comparison tests (ATLASG-2692)

disable block-sequence comparison tests (ATLASG-2692)

These tests were creating problems in CI of a regular basis, and had
become problematic.  Since we already excluded some variables from
comparisons, and the plan is to remove the sequences completely I just
disabled the comparisons.

For now I just commented out the tests, and we can then remove them
completely when we remove the sequences.