MONGOID-5904 Fix MONGODB_URI for sharded

[comandeo-mongo]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes the topology string comparison in the test runner script to correctly identify sharded cluster configurations. The issue was that the script was checking for "sharded-cluster" but the actual topology value uses underscores instead of hyphens.

Key Changes:

• Updated the topology string comparison from "sharded-cluster" to "sharded_cluster" to match the actual topology identifier

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