[Fix] Duplicate kill listener

[BrettCleary]

Removes the duplicate 'kill' handler added in from download manager PR which causes issues with other ipcMain handlers.

Also removed the pre-push test command and added os checks to certain tests that are only written for linux.

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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)

[arielj]

Looks good to me, just added a comment but it's all good

[CommandMC]

The 2nd kill method is missing the extra functionality added by #1864. To resolve this, replace

HeroicGamesLauncher/src/backend/main.ts

Line 1329 in 1e01cb2

return getGame(appName, runner).stop()

with

runner === 'sideload' ? stop(appName) : getGame(appName, runner).stop()

(import stop from ./sideload/games)

[Nocccer]

Aggree with @CommandMC. There is something missing from the sideload app. Easy fix.

fixed

[flavioislima]

Looks good. Tested here and now Login is working again.
Thanks for fixing that.