[Dynamic Regions] Enable evict-slow-trend on multi-rocksdb mode.

[LykxSassinator]

What problem does this PR solve?

Issue Number: close #6868, ref tikv/tikv#15271.

What is changed and how does it work?

Enable `evict-slow-trend` on `multi-rocksdb` mode as default.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

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[ti-chi-bot]

Hi @LykxSassinator. Thanks for your PR.

I'm waiting for a tikv member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

Merging #6885 (4ec5f23) into master (7dc9d17) will decrease coverage by 0.18%.
The diff coverage is 60.00%.

❗ Current head 4ec5f23 differs from pull request most recent head 78a6eeb. Consider uploading reports for the commit 78a6eeb to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6885      +/-   ##
==========================================
- Coverage   74.51%   74.33%   -0.18%     
==========================================
  Files         427      427              
  Lines       45149    45168      +19     
==========================================
- Hits        33642    33576      -66     
- Misses       8552     8637      +85     
  Partials     2955     2955              

Flag	Coverage Δ
unittests	74.33% <60.00%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

[LykxSassinator]

Records when building a cluster with raft-kv-2 engine(multi-rocksdb):

[2023/08/04 07:33:40.560 +00:00] [INFO] [store_config.go:231] ["sync the store config successful"] [store-address=10.233.108.15:20180] [store-config="{\n  \"coprocessor\": {\n    \"region-max-size\": \"15GiB\",\n    \"region-split-size\": \"10GiB\",\n    \"region-max-keys
\": 153600000,\n    \"region-split-keys\": 102400000,\n    \"enable-region-bucket\": true,\n    \"region-bucket-size\": \"50MiB\"\n  },\n  \"storage\": {\n    \"engine\": \"raft-kv2\"\n  }\n}"] [old-config="{\n  \"coprocessor\": {\n    \"region-max-size\": \"\",\n    \"re
gion-split-size\": \"\",\n    \"region-max-keys\": 0,\n    \"region-split-keys\": 0,\n    \"enable-region-bucket\": false,\n    \"region-bucket-size\": \"\"\n  },\n  \"storage\": {\n    \"engine\": \"\"\n  }\n}"]
[2023/08/04 07:33:40.561 +00:00] [INFO] [cluster.go:440] ["create scheduler"] [scheduler-name=evict-slow-trend-scheduler] [scheduler-args="[]"]
[2023/08/04 07:33:40.561 +00:00] [INFO] [cluster.go:446] ["add scheduler successfully"] [scheduler-name=evict-slow-trend] [scheduler-args="[]"]

And we got the following metrics:

[LykxSassinator]

Closed as #6945 is a formal one for it.