simulator: scale-in and scale out test for `store-limit-version=v2`

[bufferflies]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

run 
tiup playground nightly --host localhost --kv.binpath ./bin/pd-simulator --kv=1 --db=0 --kv.config=./tikv.conf  --pd.config ./pd.conf

tikv.conf

case-name="scale-in-out"
sim-tick-interval="100ms"
store-io-per-second=100

pd.toml
[schedule]
max-store-down-time = "5m"
store-limit-version = "v2"

Check List

Tests

• Manual test (add detailed scripts or steps below)

• No code

Code changes

Side effects

Related changes

Release note

None.

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Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

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PR needs rebase.

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