Add 2.6 release note (opensearch-project#3484)

* a

Signed-off-by: Anan Zhuang <ananzh@amazon.com>

* Add 2.6 release note

Signed-off-by: Anan Zhuang <ananzh@amazon.com>

* Update release-notes/opensearch-dashboards.release-notes-2.6.0.md

Co-authored-by: Josh Romero <rmerqg@amazon.com>

---------

Signed-off-by: Anan Zhuang <ananzh@amazon.com>
Co-authored-by: Josh Romero <rmerqg@amazon.com>

Author: ananzh

release-notes/opensearch-dashboards.release-notes-2.6.0.md

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+## Version 2.6.0 Release Notes
+
+### 🛡 Security
+
+- [CVE-2022-37599] Bump loader-utils from `2.0.3` to `2.0.4` ([#3031](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3031))
+- [CVE-2022-37603] Bump loader-utils from `2.0.3` to `2.0.4` ([#3031](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3031))
+- [CVE-2022-25860] Bump simple-git from `3.15.1` to `3.16.0` ([#3345](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3345))
+- [CVE-2022-25881] Resolve http-cache-semantics from `4.1.0` to `4.1.1` ([#3409](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3409))
+- [Security] Bump hapi/statehood from `7.0.3` to `7.0.4` ([#3411](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3411))
+- [CVE-2023-25166] Bump formula from `3.0.0` to `3.0.1` ([#3416](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3416))
+- [CVE-2020-36632] Bump flat from `4.1.1` to `5.0.2` ([#3419](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3419))
+- [CVE-2023-25653] Bump node-jose from `2.1.1` to `2.2.0` ([#3445](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3445))
+- [CVE-2022-24999] Resolve qs from `6.5.3` to `6.11.0` ([#3450](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3450))
+- [CVE-2022-25758] Bump node-sass from `6.0.1` to `7.0.3` and sass-loader from `10.2.1` to `10.4.1` to bump scss-tokenizer from `0.2.3` to `0.4.3` ([#3455](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3455))
+- [CVE-2020-24025] Bump node-sass from `6.0.1` to `7.0.3` ([#3455](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3455))
+
+### 📈 Features/Enhancements
+
+- Add disablePrototypePoisoningProtection configuration to prevent JS client from erroring when cluster utilizes JS reserved words ([#2992](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2992))
+- [Multiple DataSource] Add support for SigV4 authentication ([#3058](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3058))
+- [Multiple DataSource] Refactor test connection to support SigV4 auth type ([#3456](https://github.com/opensearch-project/OpenSearch-Dashboards/issues/3456))
+
+### 🐛 Bug Fixes
+
+- [Search Telemetry] Fix search telemetry's observable object that won't be GC-ed([#3390](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3390))
+- [Region Maps] Add ui setting to configure custom vector map's size parameter([#3399](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3399))
+
+### 🚞 Infrastructure
+
+- Fix detection of Chrome's version on Darwin during CI ([#3296](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3296))
+
+### 📝 Documentation
+
+- [Docs] Fix documentation link for date math ([#3207](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3207))
+
+### 🛠 Maintenance
+
+- Bump `re2` and `supertest` ([#3018](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3018))
+- Upgrade vega-tooltip to `0.30.0` to support custom tooltips ([#3359](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3359))
+- Allow relaxing the Node.js runtime version requirement ([#3402](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3402))
+- Make build scripts find and use the latest version of Node.js that satisfies `engines.node` ([#3467](https://github.com/opensearch-project/OpenSearch-Dashboards/issues/3467))
+- Add `@opensearch-project/opensearch@^2.x` as dependency aliased as `@opensearch-project/opensearch-next` ([#3469](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3469))
+
+### 🔩 Tests
+
+- [BWC Tests] Add BWC tests for `2.6.0` ([#3356](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3356))
+- Prevent primitive linting limitations from being applied to unit tests found under `src/setup_node_env` ([#3403](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3403))