session, util: update session to use new APIs (#22652)

[ti-srebot]

cherry-pick #22652 to release-4.0
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/22804

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/22804:release-4.0-99d0b22f04fe

---

What problem does this PR solve?

Part of https://github.com/pingcap/tidb-test/issues/1152

Problem Summary:

This fixes the session package to use the new APIs. It is expected to be backward compatible and covered by existing tests.

The bootstrap tasks between versions were not updated, as I'm not sure they will be accurately covered by unit tests to detect regressions.

What is changed and how it works?

New API usage.

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Side effects

• None

Release note

• No release note

[ti-srebot]

/run-all-tests

[ti-srebot]

@morgo please accept the invitation then you can push to the cherry-pick pull requests.
https://github.com/ti-srebot/tidb/invitations

[morgo]

This depends on #22548 merging first

[morgo]

This also requires #22640 to merge

[xhebox]

Rest LGTM

[xhebox]

This check is no longer needed.

[xhebox]

/lgtm

[tiancaiamao]

/LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• tiancaiamao
• xhebox

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[xhebox]

/merge

[ti-chi-bot]

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

Commit hash: 8ef9035

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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