Remove globally pinned `Parse` instance

[mtrezza]

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Issue

Parse Server uses and provides a globally pinned Parse object for use in Cloud Code. This is a problematic design because the globally pinned instance may be initialized properly for use in Cloud Code (masterKey, appId, serverURL, etc.), but another module like the push adapter may use a different version of parse dependency, which prevents npm from deduplicating the dependency. Code that references that other version uses an uninitialized instance of Parse which causes the error: Cannot use the Master Key, it has not been provided..

Fix

Remove the global pinning and explicitly import Parse wherever needed. Also explicitly expose the initialized Parse instance via a Parse Server API, like Parse.Server or Parse.Cloud.

[parse-github-assistant]

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