tikv: the calculation of raft-log-gc-count-limit should be based on 1 KiB instead of 1 MiB

[hfxsd]

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• This PR is translated from:tikv: the calculation of raft-log-gc-count-limit should be based on 1 KiB instead of 1 MiB docs#21966
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[LGTM Timeline notifier]

Timeline:

• 2025-11-03 05:04:12.647010034 +0000 UTC m=+73702.090039913: ☑️ agreed by Oreoxmt.

[hfxsd]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #21038.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #21039.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #21040.