BUG: Fix inconsistent GroupBy.aggregate behavior with as_index=False when grouping by external Series with conflicting names #58337#58774

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AkisPanagiotopoulos wants to merge 2 commits intopandas-dev:mainfrom

AkisPanagiotopoulos:issue58337

Commits on May 18, 2024

Ensure consistent namespace usage and correct index handling in GroupBy.aggregate with as_index=False.
AkisPanagiotopoulos
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Add unit tests for GroupBy.aggregate with as_index=False
AkisPanagiotopoulos
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