Added BSD disklabel tests for TSK back-end

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (9d70e71) 88.18% compared to head (555b886) 88.18%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #729 +/- ## ======================================= Coverage 88.18% 88.18% ======================================= Files 289 289 Lines 12227 12231 +4 ======================================= + Hits 10782 10786 +4 Misses 1445 1445 ``` | [Impacted Files](https://codecov.io/gh/log2timeline/dfvfs/pull/729?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=log2timeline) | Coverage Δ | | |---|---|---| | [dfvfs/lib/tsk\_partition.py](https://codecov.io/gh/log2timeline/dfvfs/pull/729?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=log2timeline#diff-ZGZ2ZnMvbGliL3Rza19wYXJ0aXRpb24ucHk=) | `95.31% <100.00%> (+0.31%)` | :arrow_up: |

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