Disable ModCache when running in headless mode for github tests #5179
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Description of the problem being solved:
Tests fail if they're implemented in the same pr as parsing for a mod that they require due to the github tests runner using outdated mod cache.
This pr implements a headless flag that prevent loading of mod cache when running using the headless wrapper and also separates ModCache rebuilding code into a separate function.
Steps taken to verify a working solution: