CLOUDP-321072: set minimum mongodb search version support at 8.2.0

[anandsyncs]

Summary

This pull request refactors the version validation logic for MongoDB in MongoDBSearch to improve reusability and updates the minimum required MongoDB version to 8.2.0. It also updates the corresponding test cases to reflect these changes.

Proof of Work

Tests pass

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[fealebenpae]

I think this looks good, but let's park it for now until we can get our hands on 8.2 images.