ddl: Update integration test of expr index (#10178)

[ti-chi-bot]

This is an automated cherry-pick of #10178

What problem does this PR solve?

Issue Number: ref #9891, ref pingcap/tidb#61133

Problem Summary:

TiDB disable the invalid expression index ((null)) from being created by pingcap/tidb#61135. Update the integration test cases

What is changed and how it works?

ddl: Fix integration test of expr index
TiDB disable the invalid expression index `((null))` from being created by https://github.com/pingcap/tidb/pull/61135. Update the integration test cases

Check List

Tests

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

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: The following test 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-integration-test	a3638d5	link	true	/test pull-integration-test

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[JaySon-Huang]

close because the tidb change does not backport to release-8.5