types: migrate test-infra to testify for format_test.go

[dswij]

What problem does this PR solve?

close #28005

Problem Summary: N/A

What is changed and how it works?

What's Changed: Test in format_test.go now uses testify instead

None

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[mmyj]

lgtm

[mmyj]

/merge

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[karuppiah7890]

testTimeSuite in

tidb/types/time_test.go

Line 36 in a84ceb8

type testTimeSuite struct {

is used in https://github.com/pingcap/tidb/blob/a84ceb801fe82e931cc4a454c5081c67ba9d064c/types/format_test.go which this PR removes. I'll wait for this PR to be merged to merge the PR for the issue #28010