(query assist) support option to disable summary

[joshuali925]

Description

This PR makes summary configurable. If it's disabled (default), error responses will show in an error toast. If it's enabled, it extracts the raw PPL from PPL tool's error (this is a workaround for opensearch-project/skills#138), then uses the summarize agent to show a summary.

sample configs

with summary

observability.query_assist.enabled: true
observability.query_assist.ppl_agent_name: "PPL agent"
observability.summarize.enabled: true
observability.summarize.response_summary_agent_name: "Response summary agent"
observability.summarize.error_summary_agent_name: "Error summary agent"

without summary

observability.query_assist.enabled: true
observability.query_assist.ppl_agent_name: "PPL agent"

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (8f1f83a) 53.86% compared to head (1c76442) 53.88%.

Files	Patch %	Lines
...ts/event_analytics/explorer/query_assist/input.tsx	63.63%	4 Missing ⚠️
...onents/event_analytics/hooks/use_fetch_patterns.ts	0.00%	2 Missing ⚠️
.../event_analytics/hooks/use_fetch_visualizations.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1376      +/-   ##
==========================================
+ Coverage   53.86%   53.88%   +0.01%     
==========================================
  Files         316      316              
  Lines       11309    11308       -1     
  Branches     2955     2957       +2     
==========================================
+ Hits         6092     6093       +1     
+ Misses       5169     5167       -2     
  Partials       48       48              

Flag	Coverage Δ
dashboards-observability	53.88% <66.66%> (+0.01%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.