executor: Error message is inconsistent with MySQL when execute insert into operationn

[yuqi1129]

What problem does this PR solve?

Issue Number: close #24927

Problem Summary:

What is changed and how it works?

What's Changed:

How it Works:

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

• Unit test

Side effects

• Performance regression
  • Consumes more CPU
  • Consumes more MEM
• Breaking backward compatibility

Release note

• No release note

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[tisonkun]

Suggested change

	if er := e.handleErr(nil, &vals[i], 0, err); er != nil {
	return nil, er
	if err := e.handleErr(nil, &vals[i], 0, err); err != nil {
	return nil, err

Is this PR ready for review?

[yuqi1129]

@tisonkun, Thanks for your attention, this problem is quite minor and bearable currently. so in the near future, i will pay no attention on it and it's still in draft.