[FIX][typescript-fetch] Fix duplicate imports for models with a discriminator #19195
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This PR will Fix Issue#15636 by continuing stale PR#15638.
Examining the problem further lead me to the conclusion that when the legacyDiscriminatorBehaviour isn't set the DefaultCodegen will add the MappedModels of the discriminator to the imports. As both imports and mappedModels are specified in the mustache file the import will be duplicated.
The import for the discriminators can't be removed from the mustache file as that would break the generator when legacyDiscriminatorBehaviour is set. Thus I opted for filtering out the mappedModels that are already included in the imports.
I might have formatted the changes poorly, I'd be glad if one of the maintainers could format over it.
@TiFu (2017/07) @taxpon (2017/07) @sebastianhaas (2017/07) @kenisteward (2017/07) @Vrolijkx (2017/09) @macjohnny (2018/01) @topce (2018/10) @akehir (2019/07) @petejohansonxo (2019/11) @amakhrov (2020/02) @davidgamero (2022/03) @mkusaka (2022/04)
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