[UI/UX] Remove 'Check for Updates on Startup' setting

[flavioislima]

In order to make sure people is always on the latest version of HyperPlay we decided to remove the setting that skip checks for update on startup.

AI Summary

This pull request includes changes to remove the "Check for Updates on Startup" feature from the application. The most important changes include updates to the configuration settings, the updater logic, and the frontend components.

Removal of "Check for Updates on Startup" feature:

• src/backend/config.ts: Removed the checkForUpdatesOnStartup setting from the global configuration.
• src/backend/updater/updater.ts: Removed references to checkForUpdatesOnStartup in the updater logic, simplifying the conditions for auto-downloading updates. [1] [2] [3] [4]
• src/frontend/screens/Settings/components/CheckUpdatesOnStartup.tsx: Deleted the CheckUpdatesOnStartup component.
• src/frontend/screens/Settings/components/index.ts: Removed the export of the CheckUpdatesOnStartup component.
• src/frontend/screens/Settings/sections/GeneralSettings/index.tsx: Removed the CheckUpdatesOnStartup component from the general settings section. [1] [2]

How to test

• On General Settings
• Check for Update on Startup should be gone

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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)