feat(sync-v2): Always relay vertices in real-time if the peer requested it

[msbrogli]

Motivation

The logic to decide whether we would relay real-time vertices to peer used by in the sender. But now we moved it to the client, which means each peer can independently decide whether they want to receive real-time vertices or not.

This PR removes an outdated condition that was preventing the peer to decide.

Acceptance Criteria

1. Remove is_synced() verification of send_tx_to_peer_if_possible()

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 (45281a2) 85.33% compared to head (b6cab8b) 85.31%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #861      +/-   ##
==========================================
- Coverage   85.33%   85.31%   -0.03%     
==========================================
  Files         282      282              
  Lines       22269    22267       -2     
  Branches     3367     3366       -1     
==========================================
- Hits        19003    18996       -7     
- Misses       2597     2602       +5     
  Partials      669      669              

Files	Coverage Δ
hathor/p2p/sync_v2/agent.py	78.52% <ø> (-1.01%)	⬇️

... and 5 files with indirect coverage changes

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