Add release notes for 3.4.0

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

Author: opensearch-ci-bot

release-notes/opensearch-index-management.release-notes-3.4.0.0.md

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+## Version 3.4.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards version 3.4.0
+
+### Features
+* Supporting Exclusion pattern in index pattern in ISM ([#1509](https://github.com/opensearch-project/index-management/pull/1509))
+
+### Bug Fixes
+* Fix race condition in rollup start/stop tests ([#1529](https://github.com/opensearch-project/index-management/pull/1529))
+* After remove policy from index, coordinator sweep will bind again ([#1525](https://github.com/opensearch-project/index-management/pull/1525))
+* Fix snapshot pattern parsing in SM deletion workflow to handle comma-separated values ([#1503](https://github.com/opensearch-project/index-management/pull/1503))
+
+### Infrastructure
+* Upgrade gradle to 9.2.0 and github actions JDK 25 ([#1534](https://github.com/opensearch-project/index-management/pull/1534))
+* Dependabot: bump actions/github-script from 7 to 8 ([#1485](https://github.com/opensearch-project/index-management/pull/1485))
+
+### Maintenance
+* Increments version to 3.4.0 and adds ActionFilter interface ([#1536](https://github.com/opensearch-project/index-management/pull/1536))
+* Update logback dependencies to version 1.5.19 ([#1537](https://github.com/opensearch-project/index-management/pull/1537))
+* Use optionalField for creation in ExplainSMPolicy serialization ([#1507](https://github.com/opensearch-project/index-management/pull/1507))