[computation-governance][application-manager] optimize jdbc stack log, monitor cleanup, manager thread pool optimization

[v-kkhuang]

What is the purpose of the change

This PR optimizes three aspects to improve system observability and performance:

1. Enhance JDBC executor to output full exception stack traces to frontend
2. Adjust monitor cleanup scheduled task time from 90 days to 60 days
3. Optimize application manager thread pool for better resource utilization

Related issues/PRs

Related issues: none
Related pr: none

Brief change log

• AMUtils: Optimize thread pool by reusing a cached execution context with 5 threads instead of creating new ones
• JDBCEngineConnExecutor: Add full exception stack trace output to frontend when execution fails
• JDBCEngineConnExecutor: Handle java.sql.Timestamp, Time, and Date types correctly in result set
• MonitorConfig: Change jobhistory clear day from 90 to 60

Checklist

• I have read the Contributing Guidelines on pull requests.
• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the Linkis mailing list first)
• If this is a code change: I have written unit tests to fully verify the new behavior.