chore: add Copy request to alerting chart

[yaojp123]

What does this PR do

This pull request includes several updates to the release notes and various improvements to the DataManagement and System components. The most significant changes involve adding new features to the alerting chart, enhancing the widget functionality, and updating the cluster form handling.

Release Notes Updates:

• Updated release notes to include new features: "Copy request to alerting chart" and "credential settings for agent in enrolling agent." [1] [2]

Widget Enhancements:

• Added onResultChange prop to Chart.jsx to handle result changes and trigger updates. [1] [2] [3] [4] [5] [6]
• Included a copy-to-clipboard feature in WidgetLoader.jsx for copying request data. [1] [2] [3]
• Updated WidgetLoader.less to style the new copy feature.

Cluster Form Updates:

• Modified ClusterForm.js to handle agent credentials more effectively, ensuring agent_basic_auth is always set. [1] [2]
• Improved error handling in cluster.js by using optional chaining for the error property.

Rationale for this change

Standards checklist

• The PR title is descriptive
• The commit messages are semantic
• Necessary tests are added
• Updated the release notes
• Necessary documents have been added if this is a new feature
• Performance tests checked, no obvious performance degradation