executor: migrate test-infra to testify for memtable_reader_test.go

[tisonkun]

What problem does this PR solve?

Issue Number: close #28596

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• hawkingrei
• xhebox

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[tisonkun]

/cc @hawkingrei @tangenta @lonng

[hawkingrei]

@tisonkun Please fix the linter.

[2022-03-02T04:41:35.590Z] executor/executor_test.go:166:6: `newStoreWithBootstrap` is unused (deadcode)

[2022-03-02T04:41:35.590Z] func newStoreWithBootstrap() (kv.Storage, *domain.Domain, error) {

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/2bcfa9adcca00a167a16216ca76aa5bdbfa41940

[tisonkun]

@hawkingrei fixed.

[xhebox]

/merge

[ti-chi-bot]

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

Commit hash: c468d04

[tisonkun]

/merge

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