feat(sync-v2): Stop streaming of transactions if an unexpected vertex is received

[msbrogli]

Motivation

The first_block issue caused us to not stop the streaming of transactions when an unexpected vertex is received. But it not necessary to do it anymore because the streamer server is handling this case.

Acceptance Criteria

1. Stop the streaming of transactions if an unexpected vertex is received.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (df21071) 85.43% compared to head (b0c394a) 85.40%.
Report is 3 commits behind head on master.

❗ Current head b0c394a differs from pull request most recent head 85683d6. Consider uploading reports for the commit 85683d6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #856      +/-   ##
==========================================
- Coverage   85.43%   85.40%   -0.03%     
==========================================
  Files         282      282              
  Lines       22253    22243      -10     
  Branches     3363     3361       -2     
==========================================
- Hits        19011    18996      -15     
- Misses       2576     2579       +3     
- Partials      666      668       +2     

Files	Coverage Δ
hathor/p2p/sync_v2/transaction_streaming_client.py	90.19% <100.00%> (+0.09%)	⬆️

... and 6 files with indirect coverage changes

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