scheduler: network slow store scheduler enhancement

[qiancai]

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• This PR is translated from: scheduler: network slow store scheduler enhancement docs-cn#21196
• Other reference link(s): ref Enhance Slow Store Scheduler tikv/pd#9359

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[qiancai]

/cc @okJiang

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@qiancai: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	4103456	link	true	/test pull-verify

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