lightning: save NEXT_GLOBAL_ROW_ID as uint64 instead of int64 (#45614)

[ti-chi-bot]

This is an automated cherry-pick of #45614

What problem does this PR solve?

Issue Number: close #45427

Problem Summary:

lightning wrongly use int64 to save NEXT_GLOBAL_ROW_ID.

pingcap/tiflow#9391 (comment)

What is changed and how it works?

https://github.com/pingcap/tidb/blob/f1b9da103166162944ae41dc0943c93c0b91923b/br/pkg/lightning/backend/tidb/tidb.go#L847C1-L852

nextID's type is changed to string.

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-chi-bot]

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[lyzx2001]

/cc @lance6716