importinto: change min thread to 8 for global sort

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #49008

Problem Summary:

What changed and how does it work?

• after globalsort: opt merge step mem to run on 8c #51924, we can run import with global sort on 8c machine now, so reduce this limit

Check List

Tests

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

  • I checked and no code files have been changed.

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

[tiprow]

Hi @D3Hunter. Thanks for your PR.

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[Benjamin2037]

LGTM

[zimulala]

Could we add a reason for changing this value to the PR description?

[D3Hunter]

Could we add a reason for changing this value to the PR description?

done

[zimulala]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-01 06:23:53.6333316 +0000 UTC m=+252295.160872146: ☑️ agreed by Benjamin2037.
• 2024-04-02 02:25:49.306405529 +0000 UTC m=+324410.833946075: ☑️ agreed by zimulala.

[D3Hunter]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, D3Hunter, zimulala

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[D3Hunter]

/retest

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[D3Hunter]

/retest

[tiprow]

@D3Hunter: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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