playground: init some pd configuration

[nolouch]

What problem does this PR solve?

close https://github.com/tikv/pd/issues/7507

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

  Before:

  

After:

config:

➜  pd-0 cat pd.toml
[schedule]
patrol-region-interval = "100ms"

Release notes:

NONE

[ti-chi-bot[bot]]

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[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (9acd306) 55.38% compared to head (8397fc2) 55.54%.

:exclamation: Current head 8397fc2 differs from pull request most recent head 292fae3. Consider uploading reports for the commit 292fae3 to get more accurate results

Files	Patch %	Lines
components/playground/instance/pd.go	70.00%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2351 +/- ## ========================================== + Coverage 55.38% 55.54% +0.16% ========================================== Files 328 329 +1 Lines 34825 34836 +11 ========================================== + Hits 19287 19349 +62 + Misses 13230 13175 -55 - Partials 2308 2312 +4 ``` | [Flag](https://app.codecov.io/gh/pingcap/tiup/pull/2351/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [playground](https://app.codecov.io/gh/pingcap/tiup/pull/2351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `15.37% <78.57%> (+0.05%)` | :arrow_up: | | [tiup](https://app.codecov.io/gh/pingcap/tiup/pull/2351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `33.56% <ø> (ø)` | | | [unittest](https://app.codecov.io/gh/pingcap/tiup/pull/2351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `22.34% <ø> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more.

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-01-05 01:50:45.101358579 +0000 UTC m=+2394536.138585506: :ballot_box_with_check: agreed by breezewish.