move tikv configure item pd.enable-forwarding to correct place

[JaySon-Huang]

First-time contributors' checklist

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What is changed, added or deleted? (Required)

Fix #16101

enable-forwarding belongs to pd but not log.file

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For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
• v7.4 (TiDB 7.4 versions)
• v7.3 (TiDB 7.3 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

What is the related PR or file link(s)?

• This PR is translated from: move tikv configure item pd.enable-forwarding to correct place docs#16067
• Other reference link(s): https://github.com/tikv/tikv/blob/7f708a1c5a4188c67e18ef082099928881e587ed/components/pd_client/src/config.rs#L40

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[JaySon-Huang]

/cc @nolouch

[ti-chi-bot]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-11 03:33:29.98713627 +0000 UTC m=+500599.571389960: ☑️ agreed by hfxsd.
• 2024-01-11 04:21:08.216684453 +0000 UTC m=+503457.800938140: ☑️ agreed by qiancai.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16132.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #16142.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #16143.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #16144.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #16145.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.3: #16146.