[UI Tests] Peek - fix UI tests via setting hotkeys back to Ctrl+Space combo for tests only

[khmyznikov]

This pull request introduces a static initialization step to the PeekFilePreviewTests class to ensure the correct test settings are present before tests run. The main change is the addition of a static constructor that creates or updates the settings.json file with predefined settings, including setting the activation shortcut to Ctrl+Space.

Test setup improvements:

• Added a static constructor to PeekFilePreviewTests that calls a new FixSettingsFileBeforeTests method, ensuring the necessary settings file exists and is properly configured before any tests execute.
• Implemented FixSettingsFileBeforeTests to create the required directory and write a settings.json file with specific test configuration, including setting the activation shortcut to Ctrl+Space and other test-relevant properties.

[lei9444]

/azp run

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[khmyznikov]

@lei9444 all tests pass finally: https://microsoft.visualstudio.com/Dart/_build/results?buildId=133161329&view=results

[github-actions]

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[khmyznikov]

I've broke it again