[feature] replace attachment when same name on uplaod

[6543]

come up in #9529

@davidsvantesson point

[lunny]

resolved by #9529?

[lunny]

I think so.

[davidsvantesson]

#9529 only solves a consequence of being able to upload two files with same names.
This is more related to #6563, that we don't support to update or delete attachments for releases.

[stale]

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[6543]

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