Support other integer types for SubstringUTF8 & RightUTF8 functions (#9507)#9516

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ti-chi-bot wants to merge 6 commits intopingcap:release-8.4from ti-chi-bot:cherry-pick-9507-to-release-8.4

+403-157

Commits on Oct 11, 2024

fix substring & right

gengliqi
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add test

gengliqi
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ti-chi-bot
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remove out-of-date comments

gengliqi
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ti-chi-bot
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address comments

gengliqi
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u

gengliqi
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ti-chi-bot
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fix left test

gengliqi
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