[devX] make labels only count their own occurences (#98551)
Small QoL improvement such that add_numbered_label now works more intuitively. Now if we push different labels instead of having `[reverted, mergedX2, revertX3, mergedX4, revertedX5, mergedX6]` we have `[reverted, merged, revertX2, mergedX2, revertedX3, mergedX3]`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98551
Approved by: https://github.com/huydhn
