Added 2.19 release notes. (#1468)

* Added 2.19 release notes.

Signed-off-by: AWSHurneyt <[email protected]>

* Added 2.19 release notes.

Signed-off-by: AWSHurneyt <[email protected]>

---------

Signed-off-by: AWSHurneyt <[email protected]>
(cherry picked from commit 3b6ed5f)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-security-analytics.release-notes-2.19.0.0.md

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+## Version 2.19.0.0 2025-02-03
+Compatible with OpenSearch 2.19.0
+
+### Maintenance
+* Incremented version to 2.19.0 ([#1444](https://github.com/opensearch-project/security-analytics/pull/1444))
+* Fix CVE-2024-47535. ([#1460](https://github.com/opensearch-project/security-analytics/pull/1460))
+
+### Refactoring
+* optimize sigma aggregation rule based detectors execution workflow ([#1418](https://github.com/opensearch-project/security-analytics/pull/1418))
+* Adding various OCSF 1.1 fields to log type static mappings ([#1403](https://github.com/opensearch-project/security-analytics/pull/1403))
+
+### Bug Fixes
+* Add validation for threat intel source config ([#1393](https://github.com/opensearch-project/security-analytics/pull/1393))
+* fix detector to work for trigger conditions filtering on aggregation rules ([#1423](https://github.com/opensearch-project/security-analytics/pull/1423))
+* fixes the duplicate alerts generated by Aggregation Sigma Roles ([#1424](https://github.com/opensearch-project/security-analytics/pull/1424))
+* OCSF1.1 Fixes ([#1439](https://github.com/opensearch-project/security-analytics/pull/1439))
+* Added catch for unexpected inputs. ([#1442](https://github.com/opensearch-project/security-analytics/pull/1442))
+* Refactored flaky test. ([#1464](https://github.com/opensearch-project/security-analytics/pull/1464))
+
+### Documentation
+* Added 2.19.0 release notes. ([#1468](https://github.com/opensearch-project/security-analytics/pull/1468))