PR summary should show only latest runs by default

[malfet]

For example, for https://hud.pytorch.org/pr/57331 it now shows both original and re-run of the same workflow, see screenshot below:

First link points to https://github.com/pytorch/pytorch/actions/runs/1284854980, 2nd link to https://github.com/pytorch/pytorch/actions/runs/1284845754

[malfet]

For reference, we also have #103

[driazati]

cautiously closing since this doesn't repro on that PR anymore (and we just grab whatever GitHub puts on the latest commit for a PR so it should be already de-duplicated), please re-open if you notice this again