sink(ticdc): Set config.Metadata.Timeout correctly (#3665)

[ti-chi-bot]

This is an automated cherry-pick of #3665

What problem does this PR solve?

part of https://github.com/pingcap/ticdc/issues/3352

close https://github.com/pingcap/ticdc/pull/3539

What is changed and how it works?

Set config.Metadata.Timeout correctly.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Code changes

None

Side effects

None

Related changes

• Need to cherry-pick to the release branch

Release note

None

[ti-chi-bot]

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[Rustin170506]

/merge

[ti-chi-bot]

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

Commit hash: f0543af

[ti-chi-bot]

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