Blocks being ignored because we transition the slot a couple of milliseconds later compared to peers (Sepolia long run)

[rodrigo-o]

This issue was spot on muntiple test, and was close in time to the ocurrence of #1309. After solving it in a test branch, the issue doesn't impacted on #1309 issue, but it's still a bug so this issue is created to track it and solve it. The problem is apparently related to the MAXIMUM_GOSSIP_CLOCK_DISPARITY not being taken into account. It's a P1 because it appears to be the cause of other issues, but i wasn't able to pinpoint them yet, given that the solution is pretty straightforward I preferred to tackle it now.

[rodrigo-o]

As far as i understando this won't happen on mainnet (because block proposing is not done immediately at the beginning of the slot) but it clearly affects our testnet runs.