test(ticdc): fix batch_add_table test case

[wk989898]

What problem does this PR solve?

Issue Number: ref #11879

What is changed and how it works?

set more times to check if the table exists

Check List

Tests

• Integration test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`.

[ti-chi-bot]

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[wk989898]

/retest

[wk989898]

close with #11886

[ti-chi-bot]

@wk989898: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cdc-integration-storage-test	3b91091	link	true	/test cdc-integration-storage-test
pull-cdc-integration-kafka-test	3b91091	link	true	/test cdc-integration-kafka-test
jenkins-ticdc/verify	3b91091	link	true	/test verify

Full PR test history. Your PR dashboard.

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