Remove MongoDBProxy

[kdmccormick]

We install a fork of MongoDBPRoxy and use it in edx-platform (search for mongodb_proxy). The package is extremely simple -- it just makes is so that pymongo automatically retries certain queries N times.

I hear that this feature is now baked into Mongo and/or pymongo. If we can take advantage of that builtin feature, it would be great to remove this custom mongodb_proxy package from edx-platform and archive the repo so that we don't have maintain it anymore.

Acceptance Criteria

• Confirm that the functionality of mongodb_proxy can be recreated using builtin mongo features
• Switch edx-platform to use the builtin mongo retry feature, and uninstall mongodbproxy from edx-platform
• Manually smoke-test that Studio and LMS still run when mongodb_proxy is uninstalled.
• File an Axim Systems Request, asking that MongoDBProxy be archived.

[yashathwani]

I would like to work on this issue. Could you please assign it to me?

[kdmccormick]

Thanks @yashathwani !

[yashathwani]

@kdmccormick Could you please review the pull request and, if everything is in order, merge it? Your verification and feedback would be greatly appreciated.

[kdmccormick]

Will review, thank you @yashathwani !

[kdmccormick]

New PR: #35556