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

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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