[fix](fe)support multi distinct group_concat

[starocean999]

Proposed changes

pick from master https://github.com/apache/doris/pull/17237

Problem summary

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Checklist(Required)

• [ ] Does it affect the original behavior
• [ ] Has unit tests been added
• [ ] Has document been added or modified
• [ ] Does it need to update dependencies
• [ ] Is this PR support rollback (If NO, please explain WHY)

Further comments

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