degrade TiKV Error log level for false alarms(raftstore-proxy-8.5)

[gengliqi]

What is changed and how it works?

Issue Number: Close #xxx
cherry-pick tikv#18746 to raftstore-proxy-8.5

What's Changed:

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Release note

[pingcap-cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ JaySon-Huang
❌ exit-code-1
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JaySon-Huang

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• HACKED_OWNERS [JaySon-Huang]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-09-19 14:06:20.464562425 +0000 UTC m=+19990.535056097: ☑️ agreed by JaySon-Huang.

[JaySon-Huang]

/test pull-unit-test

[JaySon-Huang]

/test pull-unit-test

[JaySon-Huang]

/test pull-unit-test