Updated macOS App Icon

[i2h3]

• Closes Use .icon #10073.
• Use new Icon Composer asset for main app bundle.
• Obsoletion of the SVG icon assets for app and Finder sidebar (the latter did not work anyway).
• Obsoletion of the build phase which renders the SVGs to PNGs and then combines them to .icns files.

[github-actions]

Artifact containing the AppImage: nextcloud-appimage-pr-10113.zip

Digest: sha256:1f9829bfbd29d9f401f2031a98c309c163f594669e2e8d722c40ce861621e1f1

To test this change/fix you can download the above artifact file, unzip it, and run it.

Please make sure to quit your existing Nextcloud app and backup your data.

[sonarqubecloud]

Quality Gate failed

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C Maintainability Rating on New Code (required ≥ A)
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[Rello]

what does this mean for the app - which area - and brander?

• classic/folderlist
  Finder sidebar icon for sync folder #8770
  randomly, the coloured app icon is displayed there. you wrote that we can not get the monochrome icon there. so we skip this part and just use the standard "folder" SF icon? or can we use this .icons file here?

• VFS

I remembered to see the monochrome here. now its the folder SF icon. will this PR change anything here?

• Brander
  if I read this correctly, the .icon is derived from the "Nextcloud-logo-white". this is nothing thats available in the brander. we have desktop-sidebar and application logo there.

how to connect the dots?

[i2h3]

• The icon for the sync folder used in the favorites section of the sidebar in Finder is selected alone by Finder. We cannot influence it. Past methods are no longer supported or still existing but deprecated APIs have no effect. That is a different topic and issue, though.
• The new, Liquid Glass effect app icon will be used also in the Finder sidebar when the FinderSync extension is running because Finder picks the main app bundle icon regardless what the FinderSync extension declares or ships.
• The file provider domain is completely unaffected by and independent from this. File provider domains actually are not ordinary folders and work differently.
• Customers need to provide a new asset, the old app icon ones are obsolete, unless we complicate the build system and allow fallbacks based on asset availability which introduces additional switches.