Assets Versioning issue with different mime types

[Maksonis]

When I upload new asset version, which have different mime type as original one, I lose original one.

Steps to reproduce (on live pimcore demo):

1. Take asset: http://demo.pimcore.fun/admin/login/deeplink?asset_69_image (it's a jpg)
   

2. Upload new version: png image
   

3. Everything looks good, but filename of old version is png. When publish old version you get filename as png, but mime type image/jpeg
   

This is issue when creating svg version of eps file, and want to revert back eps one

[dvesh3]

this is intentional behavior for cases like when you publish a version after rename or moving an asset. please see https://github.com/pimcore/pimcore/blob/10.x/models/Asset.php#L1878

@brusch "upload new version" should be used to just replace the content. wdyt?

Edit: I got this wrong...so we need to fix mime type(from current state) not the filename.

[brusch]

Fixed by #9230