fix(p2p/session): return peer to the queue in case of ErrNotFound

[vgonkivs]

Overview

Current PR fixing a case when the peerQueue becomes empty if all other peers are currently syncing. We had an incorrect assumption and didn't give a second chance to peers who were syncing.
Also, removed tracked peers pruning by score.

Tested on robusta for 1 week. The network looks stable and healthy.

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.90%. Comparing base (aecd7cf) to head (01e5e08).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #159      +/-   ##
==========================================
- Coverage   63.01%   62.90%   -0.11%     
==========================================
  Files          39       39              
  Lines        3593     3577      -16     
==========================================
- Hits         2264     2250      -14     
+ Misses       1155     1154       -1     
+ Partials      174      173       -1     

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[renaynay]

I'm fine with this change. We should clean up session at some point though.