playground: Allow configuring pd.binpath for all PD microservices

[breezewish]

What problem does this PR solve?

Currently, in PD microservice mode, users must specify binPath for each microservice, e.g.:

--pd.api.binpath=xxx
--pd.tso.binpath=xxx
...

After this PR, user can use one binPath for all microservices:

--pd.binpath=xxx    # Effective to all microservices

Users are also allowed to override binPath for particular microservice:

--pd.binpath=xxx    # Effective to all microservices except for TSO
--pd.tso.binpath=yyy

What is changed and how it works?

Check List

Tests

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

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

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

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (768dea3) 55.40% compared to head (468e619) 55.40%.

❗ Current head 468e619 differs from pull request most recent head b04896e. Consider uploading reports for the commit b04896e to get more accurate results

Files	Patch %	Lines
components/playground/main.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2347      +/-   ##
==========================================
- Coverage   55.40%   55.40%   -0.00%     
==========================================
  Files         328      329       +1     
  Lines       34822    34836      +14     
==========================================
+ Hits        19291    19298       +7     
- Misses      13225    13230       +5     
- Partials     2306     2308       +2     

Flag	Coverage Δ
playground	15.37% <0.00%> (+0.05%)	⬆️
tiup	33.56% <ø> (-0.05%)	⬇️
unittest	22.34% <0.00%> (-0.01%)	⬇️

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[kaaaaaaang]

/lgtm

[kaaaaaaang]

/approve

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This pull-request has been approved by: kaaaaaaang

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-05 04:13:38.601087119 +0000 UTC m=+2403109.638314045: ☑️ agreed by kaaaaaaang.
• 2024-01-05 04:13:56.547707606 +0000 UTC m=+2403127.584934533: ✖️🔁 reset by ti-chi-bot[bot].

[ti-chi-bot]

@breezewish: Your PR was out of date, I have automatically updated it for you.

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[ti-chi-bot]

New changes are detected. LGTM label has been removed.