docs: add Query Insights Bug Fixes report for v3.3.0

[tkykenmt]

Summary

This PR adds documentation for Query Insights bug fixes in OpenSearch v3.3.0.

Reports Created

• Release report: docs/releases/v3.3.0/features/query-insights/query-insights-bug-fixes.md
• Feature report: docs/features/query-insights/query-insights.md (updated)

Key Changes in v3.3.0

Backend Plugin Fixes:

• Query ID matching: Changed from matchQuery to termQuery with keyword field mapping
• Live Queries API: Filter out shard-level tasks
• Time range validation: Ensure from timestamp is before to timestamp
• Size parameter validation: Ensure positive integer
• Flaky test fix: Clear stale queue records when disabling metrics

Dashboards UI Fixes:

• Group By selector showing "None" after refresh
• Query ID matching in retrieveQueryById
• Indices filter, Query Count display, metric headers toggle
• Date picker for relative ranges

CI/CD:

• Cypress workflow fixes
• Branch cleanup workflow updates

PRs Investigated

• query-insights: #426, #420, #413, #414, #430, #435
• query-insights-dashboards: #366, #367, docs: add JDK 21 & Java Agent Migration report for v3.0.0 #338, docs: add dashboards-dependencies report for v3.0.0 #329, docs: add geospatial-plugin report for v3.0.0 #327