Fixed pivot-related edge case that could lead to node corruption

[MarekM25]

Changes

Scenario:

• Node offline on block X
• The update of Nethermind and sync pivot is on block X + 100
• Node won't be able to catch up with the tip of the chain without this fix because blocks (X, X+100) will be rejected as Pre-Pivot blocks and we won't download them
• In the following scenario, a node without this fix node won't work and resync will be required.

Types of changes

What types of changes does your code introduce?

• Bugfix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a change that causes existing functionality not to work as expected)
• Optimization
• Refactoring
• Documentation update
• Build-related changes
• Other: Description

Testing

Requires testing

• Yes
• No

If yes, did you write tests?

• Yes
• No