executor: move test setup code from TestT to TestMain

[unconsolable]

Signed-off-by: unconsolable chenzhipeng2012@gmail.com

What problem does this PR solve?

Issue Number: close #28440

What is changed and how it works?

What's Changed:

• Move test setup code unrelated to pingcap/check from TestT to TestMain, which can set up tests written by both framework

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• tisonkun
• wjhuang2016

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[unconsolable]

/cc @tisonkun
PTAL

[tisonkun]

LGTM. Thanks for your help!

[tisonkun]

/assign @wjhuang2016

Could you please help on merging?

[wjhuang2016]

/merge

[ti-chi-bot]

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

Commit hash: 8bd3e65

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