executor: fix cast function will ignore tht error for point-get key construction (#22869)

[ti-srebot]

cherry-pick #22869 to release-4.0
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---

Signed-off-by: ailinkid 314806019@qq.com

What problem does this PR solve?

Issue Number: close #22839

What is changed and how it works?

What's Changed:
For (batch) point get, the idxVals should exactly equal to the value in the index record. Cast errors like truncate/data-too-long will trim the idxVals value to the short another one, which will lead to unexpected results. Here we force the cast func to return all the errors.

Seems #17245 is doing the same thing, but it is only for the Overflow error.

Related changes

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

Check List

Tests

• Unit test
• Integration test

Release note

• executor: fix cast function will ignore the error for point get key construction

[ti-srebot]

/run-all-tests

[ti-srebot]

@AilinKid you're already a collaborator in bot's repo.

[zimulala]

/LGTM

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/LGTM

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[wshwsh12]

/lgtm

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[AilinKid]

/merge

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[bb7133]

/merge

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@bb7133: /merge is only allowed for the committers in list.

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/merge

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