Add test for MongoDB ping with extended details

[lucafaggianelli]

Some MongoDB clusters return advanced details like cluster time and signature with object types that are not JSON-serializable.

You're probably going to manipulate the response object here:

def _check(base: pymongo.database.Database) -> (str, dict):
    try:
        response = base.command("ping")
        return (
            "pass",
            {
                f"{base.name}:ping": {
                    "componentType": "datastore",
                    "observedValue": response,
                    "status": "pass",
                    "time": datetime.datetime.utcnow().isoformat(),
                }
            },
        )

but please notice that the response object is used internally by pymongo for its internal health check, so changing that object will break pymongo, to solve that I needed to copy the response object before modyfing it:

# this will break pymongo:
response["$clusterTime"]["clusterTime"] = response["$clusterTime"]["clusterTime"].as_datetime().isoformat()

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