Refactor funding activity signals

[nicktytarenko]

• The purpose of this PR is to align the logic to be consistent with bounty payouts, where we rely on the escrow update(on_escrow_paid)

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 82.45614% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.40%. Comparing base (06ddbcb) to head (708f4f9).

Files with missing lines	Patch %	Lines
src/user/signals/funding_activity_signals.py	82.45%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3111      +/-   ##
==========================================
+ Coverage   77.36%   77.40%   +0.04%     
==========================================
  Files         591      591              
  Lines       31954    31956       +2     
==========================================
+ Hits        24721    24736      +15     
+ Misses       7233     7220      -13     

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