*: remove sortutil

[hawkingrei]

Signed-off-by: Weizhen Wang wangweizhen@pingcap.com

What problem does this PR solve?

Issue Number: ref #34250

Problem Summary:

What is changed and how it works?

remove the sortutil by using the exp/slices library.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• ngaut
• tangenta

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/ad636a0402d250a6239a9ffe5b1eba6a6b0ded58

[tangenta]

/merge

[ti-chi-bot]

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

Commit hash: 399ebfc

[sre-bot]

TiDB MergeCI notify

🔴 Bad News! [2] CI still failing after this pr merged.
These failed integration tests don't seem to be introduced by the current PR.

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci-tidb/integration-common-test	🔴 failed 1, success 10, total 11	17 min	Existing failure
idc-jenkins-ci-tidb/common-test	🔴 failed 1, success 11, total 12	9 min 33 sec	Existing failure
idc-jenkins-ci/integration-cdc-test	🟢 all 35 tests passed	28 min	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	13 min	Existing passed
idc-jenkins-ci-tidb/integration-ddl-test	🟢 all 6 tests passed	7 min 23 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	6 min 37 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	6 min 21 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	6 min 12 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	3 min 34 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed