fix: test_payment_path_scoring failing

[okekefrancis112]

Root Cause

push_pending_event() pushes events to the pending queue without calling self.event_persist_notifier.notify(). The background processor's Sleeper never gets woken up for the new event, it only discovers it when the 100ms poll timeout expires. On slow or loaded CI machines, this can exceed the 5-second EVENT_DEADLINE.

Fix

Added self.event_persist_notifier.notify() after pushing the event, consistent with how events are signaled throughout the rest of the codebase. This immediately wakes the background processor to handle the new event rather than relying on a poll timeout.

Closes: #4085

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[TheBlueMatt]

Mmm, test-only code so just gonna land this. Didn't bother to look into if it fixes the issue but it might very well (though I haven't seen that test flake in a longggg time).

[okekefrancis112]

Mmm, test-only code so just gonna land this. Didn't bother to look into if it fixes the issue but it might very well (though I haven't seen that test flake in a longggg time).

The fix ensures push_pending_event notifies the event_persist_notifier, which wakes the background processor's sleeper immediately instead of waiting for the 100ms poll timeout. It was the only event-producing path that didn't signal the notifier. Low risk since it's test-only code.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.03%. Comparing base (924f77f) to head (1d90fce).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4395   +/-   ##
=======================================
  Coverage   86.03%   86.03%           
=======================================
  Files         156      156           
  Lines      103002   103036   +34     
  Branches   103002   103036   +34     
=======================================
+ Hits        88620    88652   +32     
- Misses      11873    11876    +3     
+ Partials     2509     2508    -1     

Flag	Coverage Δ
tests	86.03% <ø> (+<0.01%)	⬆️

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