fix(pruner): skip pruning when L1 head or chain height is missing

[EgeCaner]

Skip pruning when the L1 head or chain height isn't yet in the DB. On a fresh node the sync and L1 services race during startup, so the first onNewL1Head / onNewBlock callback can fire before the counterpart has been persisted, treat that as a no-op instead of erroring out.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.92%. Comparing base (dd42f66) to head (808316a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3616      +/-   ##
==========================================
+ Coverage   75.86%   75.92%   +0.06%     
==========================================
  Files         387      387              
  Lines       34909    34917       +8     
==========================================
+ Hits        26484    26512      +28     
+ Misses       6555     6541      -14     
+ Partials     1870     1864       -6     

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[rodrodros]

I think this doesn't solve the issue completely. I believe there is a better way of implementing this