Handle system view Processlist Not Available issue

[qingxinhome]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #15423

What this PR does / why we need it:

处理processlist系统视图升级后定义错误问题

[matrix-meow]

@qingxinhome Thanks for your contributions!

Pull Request Review:

Title:

The title of the pull request is clear and concise, indicating that the purpose of the changes is to handle the issue related to the system view Processlist not being available.

Body:

The body of the pull request provides relevant information about the type of PR (BUG), the specific issue it fixes (issue #15423), and why the PR is needed (to address a definition error after upgrading the processlist system view).

Changes:

1. pkg/cnservice/upgrader/new_add_table.go:

   • The changes include modifying the CreateViewSql to create a view with specific columns from the PROCESSLIST() function. The change uses fmt.Sprintf to dynamically construct the SQL query based on the sysview.InformationDBConst.
   • Suggestion: Ensure that the sysview.InformationDBConst is properly defined and validated to prevent SQL injection vulnerabilities.

2. pkg/cnservice/upgrader/upgrader.go:

   • The code has been updated to use ExecTxn method instead of manually constructing and executing SQL statements in a transaction.
   • Suggestion: This change improves code readability and maintainability. Ensure that error handling is robust and covers all possible failure scenarios.

3. pkg/frontend/internal_executor.go:

   • The addition of the ExecTxn method to execute multiple SQL statements in a transaction.
   • Suggestion: Consider adding more detailed logging or error handling to provide better visibility into transaction execution.

4. pkg/stream/connector/connector_test.go:

   • Addition of the ExecTxn method implementation for testing purposes.
   • Suggestion: Ensure that the testing covers various scenarios, including error cases, to validate the behavior of the ExecTxn method.

5. pkg/util/internalExecutor/internal_executor.go:

   • Introduction of the ExecTxn method in the InternalExecutor interface to execute multiple SQL statements in a transaction.
   • Suggestion: Consider adding documentation comments to clearly explain the purpose and usage of the new method.

6. pkg/util/metric/mometric/metric_collector_test.go:

   • Implementation of the ExecTxn method for testing purposes.
   • Suggestion: Ensure that the testing adequately covers the functionality of the ExecTxn method.

7. pkg/util/sysview/sysview.go:

   • Modification of the CREATE VIEW SQL query to include specific columns from the PROCESSLIST() function based on InformationDBConst.
   • Suggestion: Validate the usage of InformationDBConst to prevent any potential security vulnerabilities.

8. pkg/util/trace/impl/motrace/example/main.go:

   • Implementation of the ExecTxn method for logging purposes.
   • Suggestion: Consider adding more meaningful logging or error handling to enhance the utility of the ExecTxn method.

9. pkg/util/trace/impl/motrace/schema_test.go:

   • Implementation of the ExecTxn method for testing purposes.
   • Suggestion: Ensure that the testing adequately covers the behavior of the ExecTxn method.

Overall Suggestions:

• Validate user inputs and dynamically constructed SQL queries to prevent SQL injection attacks.
• Enhance error handling to cover all possible failure scenarios and provide informative error messages.
• Consider adding more detailed documentation and comments to explain the purpose and usage of new methods.
• Ensure that testing