tiflash: add a config named graceful_shutdown_wait_timeout

[gengliqi]

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• This PR is translated from: tiflash: add a config named graceful_shutdown_wait_timeout  docs#21734
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[windtalker]

lgtm

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[qiancai]

Suggested change

	##### `graceful_wait_shutdown_timeout` <span class="version-mark">从 v9.0.0 版本开始引入</span>
	##### `graceful_wait_shutdown_timeout` <span class="version-mark">从 v8.5.4 和 v9.0.0 版本开始引入</span>