fix(stream): fix memory leak in vtable data merge

[JinqingKuang]

Description

fix(stream): fix memory leak in vtable data merge

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

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[Copilot]

Pull Request Overview

This PR fixes a memory leak in vtable data merge by adding proper cleanup code for allocated column data.

• Adds memory cleanup code to prevent leaks in the vtable merger
• Includes additional logic for handling delayed requests in stream trigger processing
• Updates debug flags and logging levels for better debugging

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
test/cases/41-StreamProcessing/20-UseCase/test_idmp_meters.py	Updates debug flag level from 131 to 135
source/libs/new-stream/src/streamTriggerTask.c	Adds delayed request processing logic with proper cleanup
source/libs/new-stream/src/streamTriggerMerger.c	Fixes memory leak by adding colData cleanup code
source/dnode/vnode/src/vnd/vnodeStream.c	Changes logging level from DLOG to TLOG

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