*: migrate test-infra to testify for db_test

[hawkingrei]

What problem does this PR solve?

Issue Number: close #28636

Problem Summary:

What is changed and how it works?

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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[sre-bot]

Please follow PR Title Format:

• pkg [, pkg2, pkg3]: what is changed

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[hawkingrei]

/run-check_title

[hawkingrei]

/run-unit-test

[hawkingrei]

/run-unit-test

[hawkingrei]

/check-issue-triage-complete

[ti-chi-bot]

@hawkingrei: PR needs rebase.

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[tisonkun]

Covered by other PRs.