Circuit breaker log backup task when checkpoint ts does not advance for a long time

[3pointer]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

log backup stop advance by whatever reason. (usually it caused by a bug like tikv/tikv#16056). eventually we need a protection mechanism.

2. What did you expect to see? (Required)

log backup won't block GC for a long time.

3. What did you see instead (Required)

log backup block GC for a month.

4. What is your TiDB version? (Required)

below 6.5.6

[BornChanger]

/assign @RidRisR

[ti-chi-bot]

@BornChanger: GitHub didn't allow me to assign the following users: RidRisR.

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In response to this:

/assign @RidRisR

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[BornChanger]

/assign @RidRisR

[ti-chi-bot]

@BornChanger: GitHub didn't allow me to assign the following users: RidRisR.

Note that only pingcap members with read permissions, repo collaborators and people who have commented on this issue/PR can be assigned. Additionally, issues/PRs can only have 10 assignees at the same time.
For more information please see the contributor guide

In response to this:

/assign @RidRisR

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[RidRisR]

/assign @RidRisR