Adds 1.3.1 release notes (#1433) (#1532)

Signed-off-by: Bishoy Boktor <boktorbb@amazon.com>
(cherry picked from commit db7cb6d)

Author: opensearch-trigger-bot[bot]

release-notes/opensearch-dashboards.release-notes-1.3.1.md

@@ -0,0 +1,65 @@
+## Version 1.3.1 Release Notes
+
+- **[Branding] Allow for SSL setup failures (#1414)(#1417)**
+
+  [Kawika Avilla](mailto:kavilla414@gmail.com)
+
+  Setup HTTP Agent in the render portion when it did not need to be
+  it just needed a one time setup for the life time of the server.
+
+  Also if this fails to read the keys then it would fail. But it's
+  only used for custom branding. We shouldn't failed for custom branding
+  just rely on default branding.
+
+  Issue Resolved:
+  https://discuss.opendistrocommunity.dev/t/is-opensearch-dashboard-server-certificate-and-key-required-to-be-reloaded-everytime-when-gui-is-accessed/9069/13
+
+* **[CI][build] Use BUILD_NUMBER for building bundles (#1371)(#1407)**
+
+  [Kawika Avilla](mailto:kavilla414@gmail.com)
+
+  When running a release build for example:
+
+  ```
+  yarn build-platform --linux --skip-os-packages --release
+  ```
+
+  The build task runs through get_build_number and
+  checks how many commits you have locally and determines the
+  build number. From there, and this is the value that
+  is used to as a cache busting mechanism.
+
+  However, in the release build repo
+  https://github.com/opensearch-project/opensearch-build
+
+  When this gets packaged and verified it actually pulls
+  from the specified branch and only retrieves the HEAD
+  commit. Thus making the count of commits locally equal
+  to `1` and get_build_number always return `1` for releases
+  essentially breaking the cache buster.
+
+  The build repo however, sets an env variable of `BUILD_NUMBER`
+  so if this value is available it will use it instead of commit
+  count.
+
+  The CI runs the unit tests and only gets the latest commit as well
+  so instead of setting a env build number and basically creating
+  the same unit test only check this locally.
+
+  Issues resolved:
+
+  - opensearch-project/opensearch-build#1769
+  - #1363
+
+* **[Improvement] node healthcheck optimization (#1386)**
+
+  [Kawika Avilla](mailto:kavilla414@gmail.com)
+
+  Health check when enabled checked the entire cluster to get
+  the value set from the nodeId. Switching the health check to
+  query /\_cluster/state/nodes should provide the same data needed
+  for the health check without transmitting the rest of the
+  cluster state data over the network.
+
+  Issue:
+  #1354