playground: init some pd configuration

[nolouch]

What problem does this PR solve?

close tikv/pd#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]

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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%.

❗ 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 ⚠️

Additional details and impacted files

@@            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	Coverage Δ
playground	15.37% <78.57%> (+0.05%)	⬆️
tiup	33.56% <ø> (ø)
unittest	22.34% <ø> (-0.01%)	⬇️

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[breezewish]

Cool!!

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

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