v8.5.7: add new resource-control TiKV configs (#21754)

[ti-chi-bot]

This is an automated cherry-pick of #21754

What is changed, added or deleted? (Required)

Add 11 new configuration parameters to the resource-control section introduced by TiKV PRs cherry-picked into the v8.5.7 release:

• bg-cpu-throttle-threshold / fg-cpu-throttle-threshold (CPU throttling)
• bg-compaction-pressure-threshold / bg-write-io-ceiling / bg-write-io-floor (I/O throttling)
• enable-fair-scheduling / enable-read-admission-control / enable-write-admission-control
• historical-usage-window-mins / baseline-burst-pct / admission-max-delayed-count

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)

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

• This PR is translated from: master: add new resource-control TiKV configs docs#23035
• Other reference link(s):

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

[lilin90]

/approve

[ti-chi-bot]

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This pull-request has been approved by: lilin90

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