Mining should not timeout if cross stamp is not received

### Describe the problem you discovered

Currently when the mining starts, the coordinator retrieve the context from the other validation nodes.
Once the context of a node is received, all other nodes assume this node will be part of the full validation.

But for some reason the node could stop working and will never do the cross validation. So the other nodes wait for it's cross validation stamp and fall in mining timeout as they never received it.

### Describe the solution you'd like

We should find a behavior to avoid this mining timeout.

### Epic

_No response_

No files, tests, or entry points are identified in the issue. Start by tracing the mining coordinator's context retrieval, cross-validation stamps, and timeout handling, then define completion as preventing a missing stamp from causing an avoidable mining timeout.

Written by the indexing model from the issue text.