util/format: migrate test-infra to testify

[KaiyuanLiu0]

What problem does this PR solve?

Issue Number: close #26179

What is changed and how it works?

What's Changed: Migrate test-infra to testify for util/format pkg.

Release note

• No release note

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[KaiyuanLiu0]

/cc @tisonkun @disksing

[tisonkun]

Thanks for your contribution @OAkaLala ! LGTM.

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[disksing]

/merge

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/merge

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[disksing]

/merge

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

Commit hash: 69f77f2

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