Feature/v2/googleDrive (#4592)

Google drive oss. Shouldn't have any effect on pr deployment. 
Mainly the removal of the old integration via backend.
I have added the picker service and lazy loading of the required google
dependency scripts when the necessary environment variables have been
implemented.

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Co-authored-by: Connor Yoh <connor@stirlingpdf.com>
Co-authored-by: James Brunton <jbrunton96@gmail.com>