Add release notes for 3.2.0 (#1912)

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

Author: opensearch-ci-bot

release-notes/opensearch-alerting.release-notes-3.2.0.0.md

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+## Version 3.2.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards version 3.2.0
+
+### Bug Fixes
+* Fix MGet bug, randomize fan out distribution ([#1885](https://github.com/opensearch-project/alerting/pull/1885))
+* Refactored consistent responses and fixed unrelated exceptions ([#1818](https://github.com/opensearch-project/alerting/pull/1818))
+
+### Infrastructure
+* Update the maven snapshot publish endpoint and credential ([#1869](https://github.com/opensearch-project/alerting/pull/1869))
+
+### Maintenance
+* Bumped gradle to 8.14, support JDK 24; fixed backport branch deletion ([#1911](https://github.com/opensearch-project/alerting/pull/1911))
+* Increment version to 3.2.0-SNAPSHOT ([#1872](https://github.com/opensearch-project/alerting/pull/1872))
+* Revert "now publishes a list of findings instead of an individual one ([#1881](https://github.com/opensearch-project/alerting/pull/1881))
+* Moved the commons-beanutils pinning to the core gradle file ([#1892](https://github.com/opensearch-project/alerting/pull/1892))
+* Pinned the commons-beanutils dependency to 1.11.0 version ([#1887](https://github.com/opensearch-project/alerting/pull/1887))