Issue 192 execute dag restarts

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (0cca977) 99.09% compared to head (4a0cfac) 99.09%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #203 +/- ## ======================================= Coverage 99.09% 99.09% ======================================= Files 36 36 Lines 1760 1771 +11 ======================================= + Hits 1744 1755 +11 Misses 16 16 ``` | [Impacted Files](https://app.codecov.io/gh/OpenFreeEnergy/gufe/pull/203?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy) | Coverage Δ | | |---|---|---| | [gufe/protocols/protocoldag.py](https://app.codecov.io/gh/OpenFreeEnergy/gufe/pull/203?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy#diff-Z3VmZS9wcm90b2NvbHMvcHJvdG9jb2xkYWcucHk=) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/OpenFreeEnergy/gufe/pull/203/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenFreeEnergy)

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