[Feature Request]: DROP CDC TASK IF EXISTS support

[cpegeric]

Is there an existing issue for the same feature request?

• I have checked the existing issues.

Is your feature request related to a problem?

We support DROP CDC TASK but not DROP CDC TASK IF EXISTS.

Describe the feature you'd like

Support SQL "DROP CDC TASK IF EXISTS table".

Describe implementation you've considered

No response

Documentation, Adoption, Use Case, Migration Strategy

Additional information

No response

[XuPeng-SH]

similar with #21915

[XuPeng-SH]

@cpegeric please help to close this issue.