[UX] Show tab and message when Cloud Saves are not supported

[arielj]

Currently, we do not display the Cloud Saves Sync tab in the game's settings if the game shows that it doesn't support cloud saves in the metadata and if the game is linux native.

It had happened many times in the past that users can't find the Cloud Saves Sync tab and they think there's some bug when, in reality, they may be hitting one of those conditions.

So, instead of hiding the tab and letting the user figure out why they can't see it, it's more user-friendly to show the tab and explain why it doesn't work. And in the case of a GOG linux-native game we can also instruct the user to use the Windows version instead so they don't need to figure that out.

I did leave the tab ignored for Amazon games and Sideloaded apps/games because I understand Amazon doesn't cloud saves at all and for sideloaded games it makes no sense.

This is similar to what we do with the Gamescope tab, that we show it with an error message if the gamescope binary cannot be found.

The style is not great but I used the same as the Gamescope tab for consistency (just a div with red text (this is not great for themes though))

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)