Add release notes for 2.19.4

Signed-off-by: opensearch-ci <[email protected]>

Author: opensearch-ci-bot

release-notes/opensearch-query-insights.release-notes-2.19.4.0.md

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+## Version 2.19.4 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards version 2.19.4
+
+### Bug Fixes
+* Fix missing check for time range validation that from timestamp is before to timestamp ([#413](https://github.com/opensearch-project/query-insights/pull/413))
+* [BUG FIX] Fix-flaky-ReaderIT ([#331](https://github.com/opensearch-project/query-insights/pull/331))
+
+### Enhancements
+* [Backport 2.19] Onboarding new maven snapshots publishing to s3 (query-insights) ([#469](https://github.com/opensearch-project/query-insights/pull/469))
+
+### Maintenance
+* [AUTO] Increment version to 2.19.4-SNAPSHOT ([#408](https://github.com/opensearch-project/query-insights/pull/408))