util: use atomic.Pointer to replace with atomic.Value

[daemon365]

What problem does this PR solve?

Issue Number: ref #44736

Problem Summary:

What is changed and how it works?

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

[sre-bot]

All committers have signed the CLA.

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[ti-chi-bot]

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[daemon365]

/ok-to-test

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[lance6716]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.You have signed the CLA already but the status is still pending? Let us recheck it.

@haiyux please sign the CLA

[lance6716]

/ok-to-test

[lance6716]

/ok-to-test

[lance6716]

util/topsql/reporter/datamodel_test.go:332:11: invalid operation: m.data.Load() (value of type *sync.Map) is not an interface

test files should also be adjusted

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, lance6716

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-27 14:52:46.521559872 +0000 UTC m=+719331.922810319: ☑️ agreed by lance6716.
• 2023-06-27 16:02:27.125036846 +0000 UTC m=+723512.526287295: ☑️ agreed by hawkingrei.