add json_schema_valid into tidb_allow_function_for_expression_index (#19812)

[ti-chi-bot]

This is an automated cherry-pick of #19812

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What is the related PR or file link(s)?

• This PR is translated from: add json_schema_valid into tidb_allow_function_for_expression_index docs-cn#19399
• Other reference link(s): expression: JSON_SCHEMA_VALID() tidb#52780

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[hfxsd]

/approve

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