sessionctx: add optimization-time and wait-TS-time into the slow log (#17869)

[ti-srebot]

cherry-pick #17869 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/22918

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

git push git@github.com:ti-srebot/tidb.git pr/22918:release-4.0-405a5d009dcd

---

What problem does this PR solve?

Issue Number: related to #17557

Problem Summary: add optimization-time and wait-TS-time into the slow log

What is changed and how it works?

One step to resolve #17557.
Add optimization-time and wait-TS-time into the slow log.

Check List

Tests

• Unit test

Release note

• add optimization-time and wait-TS-time into the slow log

[ti-srebot]

/run-all-tests

[ti-srebot]

@qw4990 you're already a collaborator in bot's repo.

[crazycs520]

/run-all-tests

[crazycs520]

@qw4990 @Reminiscent PTAL

[Reminiscent]

/LGTM

[crazycs520]

/LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Reminiscent
• crazycs520

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[crazycs520]

/merge

[ti-chi-bot]

@crazycs520: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: 7daa3ec