DM-50087: Preload IERS data in Prompt Processing #328
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We don't need any special support to handle setting up and tearing down mock patchers; TestCase.enterContext does exactly what's needed.
This lets Prompt Processing access a cache that's been prepared at USDF, instead of a potentially slow download from official repos.
The updater can run in either service or initializer pods. It needs an extra variable (CENTRAL_IERS_CACHE) to know what to download; default is to skip download.
The function checks if the cache has already been imported and skips download if that's the case.
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This PR implements a two-part system for caching IERS data at USDF and importing it into Prompt Processing at pod start. This is expected to be faster than a direct download from IERS/ObsPM, and ensures that we do not download in the middle of processing (though by happening at pod start it will still reduce our response time at the start of a sequence).