BR: fix backup ranges total time summary log (#35552)

[ti-srebot]

cherry-pick #35552 to release-6.0
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/35701

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

git push [email protected]:ti-srebot/tidb.git pr/35701:release-6.0-3c83cd310603

---

What problem does this PR solve?

Issue Number: close #35553

Problem Summary: Incorrect total time summary log of backup ranges process

[2022/06/16 00:03:22.387 -04:00] [INFO] [client.go:567] ["Backup Ranges"] [take=67ns]

What is changed and how it works?

Fix the code of printing the log. After fixed, it shows the correct time for backup ranges.

[2022/06/16 00:17:02.284 -04:00] [INFO] [client.go:538] ["Backup Ranges"] [take=595.572234ms]

Check List

Tests

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

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

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

None

[ti-chi-bot]

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[ti-srebot]

/run-all-tests

[ti-chi-bot]

@ti-srebot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-srebot]

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

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/7fccef58b7104fbf86473a05c72a6dd9a331ff0d

[xhebox]

closed for DMR version