[Release][note][doc] Add the page of 2.1.6 release note. (#431)

Author: RocMarshal

src/pages/download/release-note/2.1.6.md

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+
+## Release Notes 2.1.6
+
+<div style={{height: '30px'}}></div>
+
+Apache StreamPark 2.1.6, as the first release following its graduation to become a Apache TLP,
+includes some improvements, and bug fixes.
+This release significantly enhances the stability and user experience of the platform.
+It's recommended that users upgrade to this version.
+
+<div style={{height: '30px'}}></div>
+
+### Features
+---
+- N.A
+
+### Bugfix
+---
+- VUE router name PAGE_NOT_FOUND_NAME bug fixed.
+- Permission Guard bug fixed.
+- Fix that Failed to update savepoint status #4134
+- Fix the issue where metrics do not update upon restart. #4149
+- Fix flink metrics watch logic error #4160
+- Fix NPE in SQL validation without operators #4159
+- Fix the incorrect Failed job state when stopping jobs #4158
+- RestOptions.AWAIT_LEADER_TIMEOUT type compatibility improvement
+- Scala TypeInformation type conversion bug fixed.
+- Set kubernetes pod template parameter bug fixed.
+- Fix alarm view css #4230
+- Trigger savepoint with path bug fixed
+- VUE router-name bug fixed.
+
+### Improvements
+---
+- Table t_app_backup ddl improvement
+- Unauthorized access to Spring Boot Actuator #4171
+- JDBC config improvement
+- JDBC-connector filterFunction improvement
+- Shell scripts improvement
+- Border style improvement
+- Code style improvement
+- TPL related migration.
+
+### Acknowledgements
+---
+Thanks contributors, users, etc. related with the work of the new version for the efforts.
+
+**Full Changelog**: https://github.com/apache/streampark/compare/v2.1.5...v2.1.6-rc1