[Fix] Installation of EOS Overlay

[arielj]

This PR fixes #2916 and fixes #2905

I added some code to prevent running the same command twice in parallel (to prevent the epic logout issue), but I didn't know that then and catch on promises does NOT change the current promise but it actually returns a new object, so I was storing/caching the current promise without handling the catch.

Because the first step installing the overlay is to get the size and then abort the command, it was throwing an exception instead of handling it silently.

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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)

[CommandMC]

Seems like the process still isn't perfect again, originally it also displayed the progress of the install in the sidebar, like regular game downloads do, but after looking at the code, this seems a lot more difficult to implement with the download manager & it working is of course the important part

[arielj]

Seems like the process still isn't perfect again, originally it also displayed the progress of the install in the sidebar, like regular game downloads do, but after looking at the code, this seems a lot more difficult to implement with the download manager & it working is of course the important part

looks like that has been broken for a long time, I tried with Heroic 2.7 and 2.8 it was already not displaying the EOS installation in the sidebar