[chat]Fix suggested actions not showing when tool calls are present

[wanglam]

Description

This PR fixes an issue where suggested actions were not appearing after tool calls. Previously, suggestions were only shown when the last message in the timeline was from the assistant, which failed to account for scenarios where tool calls followed the assistant's message. The updated logic now correctly displays suggestions by checking if the last assistant message appears after the last user message, ensuring that suggestions are shown even when tool calls are present in the conversation flow.

Screenshot

Changelog

• fix: suggested actions not appearing with tool calls

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.77%. Comparing base (1deca71) to head (96fd045).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10918   +/-   ##
=======================================
  Coverage   60.77%   60.77%           
=======================================
  Files        4533     4533           
  Lines      122246   122254    +8     
  Branches    20488    20489    +1     
=======================================
+ Hits        74291    74297    +6     
- Misses      42716    42717    +1     
- Partials     5239     5240    +1     

Flag	Coverage Δ
Linux_1	26.57% <ø> (ø)
Linux_2	38.92% <ø> (ø)
Linux_3	39.47% <100.00%> (+<0.01%)	⬆️
Linux_4	33.74% <ø> (ø)
Windows_1	26.58% <ø> (ø)
Windows_2	38.90% <ø> (ø)
Windows_3	39.48% <100.00%> (+<0.01%)	⬆️
Windows_4	33.74% <ø> (ø)

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[wanglam]

All failed functional tests are due to create index block from open search side, should not related to this PR. Should safe to merge.