chore: proper handling for null probes or streaming in kbagent

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.01%. Comparing base (fe24a3a) to head (5969513). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #8504 +/- ## ========================================== + Coverage 60.35% 61.01% +0.65% ========================================== Files 357 357 Lines 42555 42791 +236 ========================================== + Hits 25684 26108 +424 + Misses 14559 14351 -208 - Partials 2312 2332 +20 ``` | [Flag](https://app.codecov.io/gh/apecloud/kubeblocks/pull/8504/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apecloud) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/apecloud/kubeblocks/pull/8504/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apecloud) | `61.01% <ø> (+0.65%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apecloud#carryforward-flags-in-the-pull-request-comment) to find out more.

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[leon-inf]

/approve

[leon-inf]

/cherry-pick release-1.0-beta

[github-actions[bot]]

🤖 says: cherry pick action finished successfully 🎉!
See: https://github.com/apecloud/kubeblocks/actions/runs/11969804406