*: migrate test-infra to testify (#344)

[ti-chi-bot]

This is an automated cherry-pick of #344

What problem does this PR solve?

pingcap/check is no longer under maintenance, migrate to testify.

This PR can be somewhat regarded as a subtask of pingcap/tidb#26022

This closes #346 .

Release note

• No release note

[ti-chi-bot]

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• lichunzhu

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[lichunzhu]

/merge

[ti-chi-bot]

@lichunzhu: /merge in this pull request requires 1 approval(s).

In response to this:

/merge

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[lichunzhu]

LGTM

[lichunzhu]

/merge

[ti-chi-bot]

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

Commit hash: b1defa4