executor/aggfuncs: migrate test-infra to testify for func_json_arrayagg_test.go, func_first_row_test.go, func_avg_test.go, and func_bitfuncs_test.go

[budougumi0617]

What problem does this PR solve?

Issue Number: close #28504
Issue Number: close #28505
Issue Number: close #28508
Issue Number: close #28510

Problem Summary:
executor/aggfuncs: migrate test-infra to testify for below files

• func_json_arrayagg_test.go
• func_first_row_test.go
• func_avg_test.go
• func_bitfuncs_test.go

What is changed and how it works?

What's Changed:
executor/aggfuncs: migrate test-infra to testify for below files

• func_json_arrayagg_test.go
• func_first_row_test.go
• func_avg_test.go
• func_bitfuncs_test.go

How it Works:
All tests passed.

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• mmyj
• tisonkun

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[budougumi0617]

I will remove func (s *testSuite) testAggMemFunc(c *C, p aggMemTest) from agg_func_test.go and refactor func_count_test.go in my next PR, because when this PR is merged, only func_count_test.go will call the method. However, I did not include it in this change because the change in func_count_test.go is a bit larger :)

[budougumi0617]

/cc @tisonkun

[tisonkun]

Thanks for your contribution! I'll try to review in this week.

[budougumi0617]

Thank you for your response, I wait your review :)

[tisonkun]

LGTM.

/cc @mmyj

[mmyj]

lgtm

[mmyj]

/merge

[ti-chi-bot]

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

Commit hash: 7bea66f

[ti-chi-bot]

@budougumi0617: Your PR was out of date, I have automatically updated it for you.

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/run-all-tests

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