add tikv configuration item simplify-metrics

[Oreoxmt]

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• Other reference link(s): tikv should provide an option to return less metrics tikv/tikv#12355

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• Delete files
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[TomShawn]

LGTM

[Oreoxmt]

/status LGT2

[TomShawn]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: c54c079