fix: agent streaming cumulative tokens instead of partial messages

[jordanrfrazier]

Fixes issue where agent is streaming cumulative messages instead of partial.

[coderabbitai]

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	9.58% (2522/26312)	3.9% (793/20323)	4.04% (229/5660)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
831	0 💤	0 ❌	0 🔥	14.918s ⏱️

[codecov]

Codecov Report

❌ Patch coverage is 30.64516% with 43 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-1.6.5@06c9ab8). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/backend/base/langflow/base/agents/agent.py	6.45%	29 Missing ⚠️
src/backend/base/langflow/base/agents/events.py	68.00%	8 Missing ⚠️
src/frontend/src/stores/messagesStore.ts	0.00%	6 Missing ⚠️

❌ Your patch status has failed because the patch coverage (30.64%) is below the target coverage (40.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-1.6.5   #10216   +/-   ##
================================================
  Coverage                 ?   35.80%           
================================================
  Files                    ?     1221           
  Lines                    ?    58318           
  Branches                 ?     5552           
================================================
  Hits                     ?    20879           
  Misses                   ?    37278           
  Partials                 ?      161           

Flag	Coverage Δ
backend	55.76% <33.92%> (?)
frontend	8.81% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/frontend/src/stores/messagesStore.ts	4.25% <0.00%> (ø)
src/backend/base/langflow/base/agents/events.py	79.03% <68.00%> (ø)
src/backend/base/langflow/base/agents/agent.py	33.55% <6.45%> (ø)

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
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