remove header from pool if proof sync fails

[sstanculeanu]

Reasoning behind the pull request

Proposed changes

Testing procedure

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.55%. Comparing base (5adab78) to head (4e76a11).

Additional details and impacted files

@@                  Coverage Diff                   @@
##           feat/testnet-fixes    #7840      +/-   ##
======================================================
+ Coverage               77.53%   77.55%   +0.01%     
======================================================
  Files                     883      883              
  Lines                  124506   124535      +29     
======================================================
+ Hits                    96536    96579      +43     
+ Misses                  21558    21543      -15     
- Partials                 6412     6413       +1     

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