playground: fix scale-out cdc command

[lonng]

Signed-off-by: Henry Lonng [email protected]

What problem does this PR solve?

Try to close: #1934

What is changed and how it works?

The playground mix use of string literal ticdc and pre-defined component type spec.ComponentCDC and they are inconsistent.

Check List

Tests

• Manual test (add detailed scripts or steps below)

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:

Fix playground scale-out CDC node failure issue

[ti-chi-bot]

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• AstroProfundis

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[AstroProfundis]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 0b0194b