topsql: add sql sum execution duration information

[crazycs520]

Signed-off-by: crazycs520 crazycs520@gmail.com

What problem does this PR solve?

close #31144

Add SQL sum execution duration information for TopSQL.

Check List

Tests

• Unit test

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• breeswish
• tangenta

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/6eeb10bbe7a0d983956da3cb6c46e5ba13b090b8

[mornyx]

LGTM

[tangenta]

/merge

[ti-chi-bot]

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

Commit hash: 7204ae3

[ti-chi-bot]

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[ti-chi-bot]

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